Neat little idea I got after reading Fallout X RWBY crossover "New World Blues" I personally like the idea of insanity ensuing in a crossover and one side is desperately trying to stop it. So, Doomguy or Flynn Taggart is a happy-go-lucky psycho and still wants to kill things. Also, game mechanics do apply.

Edit: Holy shit, three years since I've touched this. Christ almighty this is terrible.


"Hah! Suck it BITCH!" The Doom Slayer steps on the Spider Mastermind's corpse, blood and guts were everywhere, the BFG 9000's plasma blast having nearly decimated its head, leaving only a husk of a corpse that used to be the Spider Mastermind.

While basking in his righteous glory of ending the motherfucking Mastermind of Hell, a message appears on his HUD saying "TETHER ACTIVATION" and some type of blue electricity seizes him. A second later white overtakes his vision.

Waking up, he realizes he's floating above a pentagram in some sort of containment chamber about big enough to fit one of those floating meatball things. It takes a second for him to come up with a name: Cacodemons.

Then, a figure appears after his moment of thought. Samuel Hayden, the tall, porcelain white robot man. "Oh fucking Hell, not you." He cringes at that last pun, and admits that it was pretty bad. If it was one anyways.

Then the leader of the UAC starts going on about how Argent Energy is important and Flynn's motivation and all that.

The Doom Slayer stopped listening half-way and silently prays for the scientist to shut up, then he's engulfed by the same blue energy and then everything goes white.

/

It was a pretty bad day for Tracer and her friends today. For one, she was, for maybe the first time ever, pinned down by gunfire while Mercy, D'Va, Lucio and Genji were off somewhere she couldn't see. The Talon goons wanted to push an EMP device throughout King's Row to deactivate all the Omnics in the area, which is pretty bad considering racial...

Would it be considered racial? They're different species...so it would be speciesism.

Speciesist tension, yeah. Although it's a bit of a weird word to use, that's it.

The illegal Overwatch were trying to hold a point in form of a square and clearly marked by a blue border, that when held onto by Talon operatives for long enough, the EMP bomb would just roll on out of the giant garage door But since Overwatch is here, and an agent is currently standing in the square, Talon can't get the EMP, because there is a conflict of interest, and the truck carrying the bomb refuses to come out because of it.

The current situation is pretty bad; Tracer is the only one holding the point. Genji said that he would flank the Talon agents, while Mercy was going to help D'Va who was wounded after not standing far away enough from her detonating MEKA (even though she knows the exact blast radius of it) and Lucio was off skating somewhere, playing his music that somehow heals or makes his allies move faster. Which can't be good at all for the legs, but that can be overlooked.

Tracer is still huddled up beneath a car being pelted by bullets raining down from the roof behind that giant statue of Tekhartha Mondatta who unfortunately died because she couldn't save him in time and it's all her fault because she's an incompetent bellend that can't do anything-

Right, her life is very much under threat, and this is no time to think about past mistakes. Well...it wasn't a mistake so much as a result of incompetency-

Lena, get yourself together, there's a story to be told!

She's pulled out of her thoughts as a blinding white light engulfs the area, forcing her to shield her eyes with her arm. It takes a few seconds before that flash that would definitely fetch a nice workplace injury lawsuit to die down.

In the middle of the two sides (one side being her, the other being the nameless Talon goons being very trigger-happy), around the statue, a massive man in thick-looking green armor stands, with a chainsaw in his hand, and what looks to be a massive assault rifle on his back.

The Talon infantry were about to continue shooting and so was Tracer but the man raised both his hands, holding his palms at both sides.

"WAIT!" He screams out, and everyone points their guns downwards for a second. "Who do I shoot!?" He gives both sides a glance.

Tracer immediately points at the Talon operatives and screams "THEM!"

Of course, the opposition yells "HER!" in unison and every soldier points towards Lena.

"I dunno, fight's kinda looking mismatched, she doesn't look to be very strong, pretty small-" The man says, rubbing his hand on the chin of his helmet

"Hey! Rude!"

"Right, but that doesn't make me wrong, does it?"

"Fair point."

There's a tense silence.

"Well, my mind's made up!" The man pulls back the handle of his chainsaw which makes the motor come to life and the scary blade to start spinning. "Whoo hoo!" He starts chasing after the Talon operatives that may have shat their pants all at once. He successfully reaches one of them at the same time Mercy comes gracefully gliding down from the sky.

"I heard screaming is everything-OH MY GOD WHAT IS HE DOING!?" What she just saw, was the Doom Slayer tearing someone in half with a chainsaw while laughing maniacally.

The massive armored man continues his mad rampage, seeing how they all retreated in a line, he ran beside the one leading the retreat and stuck his chainsaw out.

"No-NOOOOOO!" Was the last thing Lena heard from a Talon goon before all of their heads started flying everywhere. A spine fell on Angela, tainting the white Valkyrie suit with a crimson red stain.

"I guess you got too AHEAD OF YOURSELVES!" There is no reaction the pun, and Mercy's lips go flat. There is the signature 'long-exhale-through-nose' from her. "Was it that bad?"

Yes, yes it was, Flynn. The narrator quickly retreats himself before anyone can notice.

"…That was boring." The man's voice is a bit gruff, and rough around the edges, but has an odd...childishness to it.

"How was that boring!?" Lena yells back at him. "Pretty sure it's a little overkill, love!"

"Nah!" The man walks back to Tracer and Mercy, juggling the Talon goons' heads. How he managed to procure them so quickly, no one will know, except for him, of course.

"Why are you juggling their heads!?"

"Why not?" Is the only answer Lena got from the man. Then there is an extremely loud rumbling come from him. "I'll be right back." The green-suited tank of a person goes into the hotel nearby and comes out with dozens of styrofoam containers worth of stolen food. Not to mention the screaming employees running after him, however they all suddenly go out of focus from the scene.

He seems to be eating through the helmet, which is pretty odd, but considering what this guy just did a few seconds prior, they'll accept it.

"That was nice." He burps, and pats the armor on his stomach.

Genji jumps down beside him, and raises the headless corpse of a Talon operative currently missing a head and a spine, while also spewing blood from his new cavity like a damned volcano.

"Are you…responsible for this?" He asks before dropping the body and kicking it away, well, as far as his small legs on his equally small body can.

About three feet, by the way.

"Yep!" The man cheerfully said.

Genji gags a little. "I…have not seen such brutality since my near-death by the hands of Hanzo."

The man coughs. "Welp, I'm off!" Then the man runs off, but Tracer gives chase, is in front of him after a few blinks. Although he is faster than she thought, no one could outpace the one and only Tracer, poster child of Overwatch and absolute failure of an actual agent!

Not now, Lena.

"Not so fast," she says, and stops the man in his tracks with a raise of her palm.

Said man starts tapping his foot, to no particular rhythm, which infuriates Genji a bit. "Name's Flynn Taggart, marine from UAC facility on Mars, born in the US, home in Maryland. Happy?"

Tracer blinks, with her eyes, this time, would be pretty awkward if she did the other blink and opens her mouth but doesn't say anything.

Flynn takes that as a yes and speeds right past her. Realizing he's gone, she pursues him, blinking, the teleportation one, a few more times and lands in front of him again, making Flynn tumble and fall backwards.

"What else do you want?" He asks

"Right, you're coming with me." The Marine stared at Lena for a few seconds under his mask.

"Nope!" He starts slowly shaking his head and quickly stands back up at a breakneck speed.

Not willing to let this go, Tracer goes after him. This time, he is somehow even faster than the last two time and nearly outruns her. However, the nearly is emphasized because he actually didn't, cause she's faster than his faster.

Look they're both abnormally fast, one more so than the other.

She taps his shoulder then blinks in front of him.

"Oh for fuck's sake I'm not coming with you!" He says, then shoves past her, nearly sending her to the floor.

Tracer put two fingers on her earpiece, "A little help please?" And while she's talking, the Space Marine is gone, and a trail of dust is all that's left.

Luckily, she put a tracker, it's on his shoulder.

"Follow the tracker." Pretty much everybody in the Overwatch fireteam responds, creating a very unpleasant harmony of affirmatives that might have shorted out some devices and shattered some ear drums.

The fireteam in question consists of only twelve operatives that stand around somewhere, on standby: Sometimes a theater, sometimes somewhere else. Then trouble would come, cause it always does since the Intelligence has been gathered beforehand, and six of the twelve would head out, while the other half watch for anything else unexpected. Usually petty crime like theft and/or assault (threats of unlawful physical contact) and battery (unlawful physical contact).

Usually the 'battery' part of the combo has to be witnessed as no agent wants to stalk an unsuspecting civilian cause they thought they said that they were going to hurt someone.

while six from the twelve would leave for the mission, in some cases it was five, like right now.

"He's headed for the giant clock tower. I'll get there before him." That was Jesse McCree, former gang member and expert marksman with his giant revolver.

"I'll go along with McCree." That was Torbjörn, Swedish weapon designer and obligatory short person of the team.

Why obligatory? No one knows, it's just a thing. The void's that has been made without him has been affecting morale.

"I'll be on the rooftop near the clock tower." Hanzo, former member of the now-defunct Shimada Clan says. There are some pitter-patters as he quite audibly climbs a wall, somewhere where no one can see.

"The rest meet up with me at the clock tower!" Tracer spoke into the radio.

Everybody that didn't respond earlier answer with a "Roger!" that is eerily in sync.

/

Flynn sprints through the alleyways of King's Row, being chased by a cowboy and a dwarf, both yelling expletives and trying to get him to slow down. He doesn't know where he's going, and eventually ends up at a brick wall. A dead end, great. Those two creepy guys are approaching, too.

"I've been to Hell before, worldly constructs don't mean anything to me." The Marine takes out his rocket launcher and shoots the brick wall, severely weakening it. He silently compliments the person who laid these bricks and then runs right through, making a tank-sized hole.

He's heading for that clock tower in the distance. He doesn't know why he wants to go there other than the fact that it looks nice and he wants good photos of it.

Yeah, he knows. Hell has really fucked up his priorities, but what can you really do when every living(?) thing in sight has to be killed?

Flynn continues his mad dash towards the clock tower, looking behind himself as revolver bullets ping off of his legs' armor, bouncing to the floor and leaving grey trails that disappear after a second. They were trying to incapacitate, not kill him!

Sucks for them! He thinks, and runs even faster. A minimap pops up on his HUD, thanks Praetor Suit! Anyways, it's a layout of this area of Great Britain somehow automatically acquired through very legal methods of using someone else's satellite. It isn't illegal at all, ask a lawyer. Simple case of borrowing.

Don't actually do that, they'll say that it is in fact very illegal.

He runs right through a chain-link fence and into the backdoor of a hotel, shattering lots of glass on the way. He speeds through the lobby of that hotel, going through all the tables, chairs, and trolleys that can possibly be hurtled. Why he did that, he doesn't know, but he can conclude that it does feel good.

He's near the clock tower.

That's good, I guess. There is a chain link fence surrounding the area surrounding the giant clock tower but didn't do much in terms of protecting it, as he just made a large, giant-man sized hole in it. He checks the time displayed on the giant clock tower. It is currently one minute before twelve.

"It's high noon…" The voice from cowboy-man behind him is surprisingly loud.

Flynn checks the time again. It is now twelve o'clock. In fact, it isn't even high noon! It's midnight!

Anyways, one of the cowboy's eye has a glow to it somehow as he holds his arm horizontally in front of himself with his other hand hovering over the holster on his waist.

"Draw!" Cowboy-man says, then let out six shots all directed towards him. All six bullets land but never go past the initial layer of armor plating.

"That is some hard armor," the cowboy states, sounding very much surprised. He looks to his gun, and gives it a smack.

The small dwarf, that Flynn will now dub 'Dwarfy' is leaning on a turret with two barrels that weren't shooting Flynn right now, but they do seem very enthusiastic about the possibility.

He looked at the turret. "Does that thing even have bullets?"

"Yes." Dwarfy replies.

"Sooo…what now?" Flynn asks.

"You ask me," Dwarfy shrugs, then gives his contraption a smack on the top.

"Well…I gotta go then, bye!" Flynn starts his mad dash again.

The turret locks onto him and shoots at both his legs with enough force to knock him down.

"I'm still moving!" Flynn stands back up and continues his escape, at least attempts to continue.

The turret fires again and knocks him over again. "I'm not giving up!" And he stood back up and ran again.

The turret fires again, again, and knocks him over, again, again. "Fuck! You!"

And he stands back up again, again, again and tries to run once more.

Just like the last two times, the turret fires with pinpoint accuracy and makes him fall on his front. "Is this your way of torturing someone!?"

While he was on the floor, he flops to his back not before noticing a man on the roof aiming a bow and arrow on him. "And the fuckin' Jap up there can put the bow down!" Flynn also realizes that he just assumed that the Asian man pointing his pointy weapon at him is Japanese, which is quite racist. He also realizes he was right, as the man pulls on the string of his bow even tighter. That makes his usage of 'Jap' worse, since it's a racial slur that should be avoided.

"Okay that was racist I'm sorry." He raises his hands. "I didn't mean it, just blurted it out."

He waits for a few seconds, still laying on the ground, having essentially given up on trying to use his feet, since that turret would just push him down again.

It takes a few minutes for him to motivate himself to stand back up, and as he does so, nine people were suddenly surrounding him.

Which included, very fast British girl, ninja cyborg, Angel wings, giant ape with armor, giant man with armor, eighteen-year-old girl with mech, robot monk, Asian woman that was from Antarctica and generic soldier number 76.

Eighteen-year-old girl with mech said sometime along the lines of "GG."

"Alright fine, if you want me that much." Flynn raised his hands. Holding them out to show that he has just given up. Again. Very fast British girl quickly teleported her way up to him and put him in handcuffs.

"Let's go."

Deciding that he needed to artificially extend the length of this chapter, it was time to piss someone off. "Last I heard apes were in zoos." The ape-man, suddenly enraged by the comment, roars then his eyes start glowing red.

Very fast British girl teleports backwards, narrowly avoiding getting smacked in the face.

And everybody knows...actually only one person knows what happens when the Doom Slayer is let free. Flynn breaks the cuffs and restarts his mad dash, jumping on that giant pink mech, using his Thrust Boots to get him further up. Upon landing, he pushes off the floor and sprints away.

The turret fires at him again but he doesn't really feel the bullets. An arrow bounces off of his armor.

"How hard is it to stop just one guy?" Tracer's shoulders slump forward, and she sighs.

/

A man is watching the news. It's displaying live footage of an absolute truck of a man running past a circle of nine people, with one of them going after him. The news anchor, deciding to be compete for the title of 'world's most boring person' does his commentary on the helicopter POV of the chase. "He's running, he's running. He doesn't seem like stopping." The man on the television is approaching an oddly familiar building.

Before it dawns on him.

That's his house. He knows that exact wall like the back of his hand! And it's about to be destroyed right before his very eyes!

And seconds later, the man from the TV bursts right through his abode being followed by a very pissed off ape.

The man looked at the new entrances to his house in shock, and clutches his heart as he slumps down on his couch. He doesn't notice the eleven other people pursuing the two.

"Sorry!" A British woman in a brown bomber jacket and tight orange spandex says before they all follow the angry ape and the green man.

/

Flynn continues running through walls with enough speed to shatter said walls and through other people's houses.

The giant ape is obviously very, VERY mad at him.

The red in its eyes gives the vibe of "I'M GOING TO FUCKING END YOU AND SEND YOU TO THE DEEPEST PITS OF HELL." Not that he went there before. Well, he did, so that threat doesn't really menace him anymore.

Flynn turns around and faces the pissed off monkey, he comes up with the best excuse he can.

"Yo chill man! It was just a prank bro! IT'S JUST A PRANK!" The ape, unfazed at his attempt to pacify it continues chasing him. "God dammit the phrase doesn't work anymore!" Flynn curses to himself.

Yes Flynn, because a very shitty and dead catch phrase from 2016 is very likely to calm down an ape that's been dearly insulted.

He breaks through more walls, and more houses of other people before eleven people stood in front of him after the…thirteenth wall? He doesn't know. He didn't count.

He stops, his brain finally kicked in for once and knew that he's dead meat if he tried anything. Especially with this unexpected new weight on his shoulders-

The ape is on him.

Flynn Taggart, despite being the literal definition of twitch reaction speed, would sometimes forget to take in or even register in his brain something bad that was happening to him. It's like he's phasing in and out of the corporeal plane of existence sometimes.

The Space Marine falls to the floor, expecting his brains to be blown out by a HULK™ SMASH!™ from the ape. But he doesn't feel it. "It's just a prank…?" He squeezes out through crushed, collapsed, punctured and maybe flattened lungs.

Maybe it did work! He muses to himself.

It didn't.

Then the world goes silent. The only sounds were handcuffs clinking onto his hands and the sounds of the ape getting off of him.

"Ahh fine…" The Doom Slayer, knowing that it would just be wasted effort to try and break out.

/

When they everyone got back to the field base, a dropship came down from above and everybody neatly filed filed themselves inside. Including the crazy Flynn Taggart who had extra tied up with extra-thick rope and a plush toy in between his arms as to make him a bit comfier. Angela's idea, of course.

Tracer walks up to Flynn, who's sitting down and looking at his bindings. His breathing is a bit louder than she'd like, which scares her a bit.

"Why are you killin' Talon, love?" She asks, getting a shrug in reply. "And why a chainsaw?"

"I just want to."

Lena wasn't buying his explanation, "Well, why do you want to?"

Again, Flynn shruggs, "It's fun."

That is when Mercy jumps in, "Killing is fun for you?" She asks, her curiosity now aroused.

The Marine shrugs, again. "It just feels right."

"Why is it fun? How can it possibly feel right?" The medic asks, crossing her arms and embodying a more suspicious aura.

"I dunno."

"So out of nowhere you just wanted to kill things?" D'Va joins in, leaning her head back on the chair.

The Space Marine faced her with an expressionless stare under his expressionless mask. The double expressionless, like multiplying zero with zero.

Not exactly, that would probably destroy the world.

"Pretty much," he says.

"Where do you come from?" Mercy asked.

"Mars, far as I know."

"What?" She looked at him with a puzzled expression.

"Last I remember; I was on Mars." Flynn rotates his neck, exhaling in relaxation as he gets a resounding snap. "Don't worry, that's perfectly normal, for me at least."

"With all those guns?" Mercy pressed on. "That snap is definitely not normal, we'll have to do a checkup soon."

"I was fighting off demons on Mars."

Mercy decided to take the bait, "Where do these demons come from?"

"From Hell." Everybody, even Lucio, who was always busy with his music, turns to him.

"What?" They all say, in uncanny and very creepy sync.

"I went to Hell." The Marine says rather casually. "And back, then in again, then back, rinse and repeat. You get the point."

The guy doesn't even seem remotely traumatized at what he's spewing!

Everybody blinks, again, in horror-movie-like unison, before Soldier: 76 leans towards him, from across the width of the dropship. "That, is the biggest load of bullshit I have ever heard in my life, and I had to live with Rey-"

"Not now, Jack."

"Don't believe me? Take off my helmet. Tabs to press in around the sides, just feel around you'll get them." Flynn says, cocking his head to one side.

Mercy puts her hands on the bottom side of his helmet, and feels around for the mentioned tabs. "Aha!" She says to herself, then takes off Flynn's helmet with a satisfying pop followed by a quiet hiss. Like opening the vacuum sealed corpse of a fresh experiment-

That wasn't supposed to be thought about.

"There should be a storage device on the back of it." She spins the helmet around per his command, feeling all the intricate textures with her fingers. She looks on the back of the helmet and finds a small memory card lodged in its rightful slot. She pushes it in with her nail which in turn ejects the little device out.

"Put that in a computer or something." The Marine says, speaking of Marine, Flynn Taggart is an offensively handsome person, well for somebody that likes murdering things and being the definition of the word 'manslaughter'.

That was according to Tracer, at least. Brown hair that's cut to the back of his head but became a bit long on the top of the forehead with grizzled features that clearly contradicts the joyful and clearly childish behavior.

"D'Va, is it okay if I use your tablet?" Angela asks. D'Va stands up, dug in a small bag on her seat and takes out a small tablet, tossing it to her afterwards.

The medic inserts the memory card into the slot in the tablet. It recognizes the storage and a rectangular pop-up appears: "PLAY VIDEO?" There are two prompts: "Y" or "N". She taps the "Y" prompt.

A video starts playing, and everybody in the dropship huddles up to the tablet to get a glimpse at the screen.

Then it played. It shows a man putting on the helmet and looking down at Flynn's massive suit.

Then...pure insanity.

Everyone watched with different reactions, some were disgusted, some were intrigued while some thought it was cool, some, such as Winston and Reinhardt who couldn't stand the violence anymore went off to go puke somewhere, hopefully in a spot that is easy to clean.

The video was only ten minutes long and ten minutes is enough for everyone to see that this man, Flynn Taggart, is indeed not bullshitting them. Practically the only thing everyone could remember were the shotgun blasts and the squelching of demons practically exploding at every turn.

The video ended. Another prompt appears, "PLAY PART 2 OF 45?" With two prompts, "Y" and "N". D'Va takes the tablet from Mercy's hands.

"I'm watching this for my late-night binge."

"Have fun with it, although the ending is kind of bullshit. Actually, very bullshit. Which is also how I came here." The Doom Slayer says.

"Alright fiiine. I'll watch with Hana." Tracer rests her head back tiredly.

The dropship pulls downwards. "Arriving at Watchpoint Gibraltar."


This is probably a mini-series. Mostly for shits and giggles.

Edit: Wow, this was a mess to revise.