AHAHAHAHAHAHAHAHAHAHAHAH.

I've been absolutely PUMPED to write this for the past two months.

However, there's a few things you need to know first.

First off, this is actually a tri-crossover of Doctor Who, Sarah Jane Adventures and Torchwood, but it is absolutely not required in any way for you to have watched more than just Doctor Who.

Also, this is TECHNICALLY a sequel of my other story, "Lost Companions", but again, it's not required for you to have read this.

The only things you need to know that you don't already:

Rose is back in this Universe.

Donna has her memory back.

If those two details at all interest you, then read my other stories. BUT SERIOUSLY GUYS, IF YOU'VE GOTTEN THIS FAR, THEN READ THIS STORY. I don't like begging, but I've been so excited to write this. I don't think the plot will disappoint.

Space and Time rolled together, clashing, retreating, ensnaring and eventually reaching some form of a treaty as they spun, forced to be connected in the great, endless majesty of the Universe. They toiled as one, guardian of everything, protector of all that lay before them and worked around them. They adjusted to fix problems, shifted to avoid blips. The two would do anything to stop a crack in the Universe, or to keep a glitch from occurring.

But some things can't be avoided.

There was an unstoppable tremble that both Time and Space experienced, and it shook them to their core. They were powerless to stop it as a shudder rippled through the Universe, and from it came something that shouldn't be there. It was small, it was purple, but what it looks like doesn't matter right now.

It seemed harmless. All it did was float in the empty space, studying the Universe it had been thrown into. It rolled through the majesty that was nothing, and then eventually seemed to make up its mind and began hurtling through space.

Time and Space watched this with infinite sadness, for there was nothing they could do. They wished in vain that they could reverse the appearance of the object, send it back from where it had come. But quickly their worries ceased as they saw they weren't the only ones who had noticed.

Far beneath them, on the planet Earth, someone was speaking.

"Mr. Smith, I need you."

Several miles away, a man in a trench coat was poised on a rooftop, watching the busy shopping street beneath him with an air of apprehension. In one hand he hand a walky-talky, buzzing softly, and in the other a hand held tracking deceive that was beeping, slow and rhythmic.

He lifted the walky-talky to his mouth. "Is he on the street yet? I'm seeing nothing."

There was a faint pause and then Gwen Cooper's disconnected voice crackled through. "Cool it, Jack. We've almost got him."

"Whatever it is that that guy's found," Captain Jack Harkness replied. "It's definitely alien. I'm not letting him get away."

"He's almost on your street," her voice said after several seconds. "Get ready."

"Always am."

"Alright you too, stop it," Rhys Williams' voice came through the two walky-talkies. "That's my wife, you know."

Jack sighed. "Everything I do is flirting these days," and then - "There he is!"

A tall, gaunt man in a black leather jacket was running down the street at breakneck speed, pushing others out of his way, something clutched to his chest. Seconds later an unassuming black van labeled, "Torchwood," spun around the corner, following in his destructive path.

"The crowd's getting thick again," Rhys said through the walky-talky. "Where is he, Jack?"

"At the four-way intersection up ahead. He's turning – right. It's a dead end."

He watched as the car screeched responsively in the same direction. He could see, indistinctly in the dark, the shapes of Gwen and Rhys lunging from the car and running to the man. He saw him vault over the brick wall, but in the process the alien package fell from his grip and Gwen picked it up.

Seconds later, her voice huffed into the walky-talky: "He got away, but we-"

"Got the thing, I know." he said. "Take it back to base, I'll be there soon."

"Got it." He watched to make sure they got in the car, and then began shimmying off the side of the building, planning to climb down. As he was pocketing his walky-talky, however, his tracking device suddenly began beeping loud and fast, in an urgent, dangerous kind of way.

Jack held it up to his face and frowned. It was trying to alert him of something several miles away, something alien. He honed in on the signal – it appeared to be a fallen meteor of some sort. "Get it in the morning," he mumbled to himself, still frowning.

With a sigh, he lunged off the building.

Lights whirred and flashed as the TARDIS console splayed with color and Gallifreyan symbols. Nebula of light gurgled across the screen and flashed away. A tracking device flared on the screen, showing a fallen meteor, several miles outside of Cardiff.

"Hmm," the Doctor said meditatively as he watched the screen. "Well now you, you are an odd one." He poked the console on the place where the meteor was. "How is it that you can land without making a single sound? There was barely even an impact. Impossible for anything but alien technology to trace you. So what are you...?"

He ran a scan of the area, furiously punching buttons and twisting knobs, all the while his eyes never leaving the console. His trusty TARDIS, however, had no explanation for what the meteor was. "C'mon on girl," he asked it plaintively, soft green eyes flickering across the screen.

Nothing.

He watched the red dot, the meteor, with an unreadable expression and finally muttered to himself:

"At least I know what I'm doing tomorrow."

The next morning, Rani Chandra let herself in to Number 13 on Bannerman Road using the key kept in one of the flower pots. She closed the door behind her and turned to see Clyde Langer lounging on the couch in the front room, pencil in one hand and drawing book in the other.

"Hello, Clyde," she said, grinning as she abandoned her bag on the chair next to him.

"Hi," he looked up from the drawing. "Glad it's the weekend, right?"

"Yeah. Where is everyone?"

"Didn't you hear?" he frowned slightly as he put his drawings on the coffee table in front of him. "Luke's back at school, and Sky went with him to tour the campus. She literally learned everything at our school overnight, what with that super alien brain of hers. She wants to study electrical engineering, can you believe it? She'll probably end up blowing the fuze of everything she touches."

Rani laughed. "Don't be mean. I can see her doing it. So it's just us this weekend?"

"Nah, she's gone for the whole week." he grinned. "We get the place to ourselves."

"Well yeah, except- wait, shh." She raised a finger and frowned, listening.

"Wha-" He stopped as well, ears pricked.

Both of them slowly became aware of a thudding sound overhead – Thump, thump, thump, th-th-th-th... Silence, and then it repeated itself.

"What?" Clyde exclaimed, standing up.

"C'mon, it's coming from the attic," Rani said, and they headed up the stairs.

A good climb later, they pushed open the attic door to see a thin, petite brown-haired woman perched on a stair step, a glowing reddish-pink ball in hand.

"What's that?" Clyde asked, pushing past Rani.

"An alien toy," Sarah Jane Smith explained, rolling it around in her fingers, "Given to me by a little alien girl who crash-landed last night. I fixed her ship, and," she smiled, looking back at them. "This is my reward."

"That's what was banging around up here, then?"

In explanation, she tossed the ball across the room. It bounced hectically against the walls and furniture, slowing down and coming to rest on the floor, and the moment the movement ceased it lunged back into her hands. "It's linked to it's owner. If I can ever get Luke to bring K-9 up here, I think I'll make it his toy."

Rani snickered under her breath at the idea of the robot dog chasing that glowing ball across the room.

"Anyway," Sarah Jane said, standing as she placed the ball on a shelf nearby. "Down to business."

"What, alien business?" Clyde asked, unable to keep the excitement out of his voice. "Did you see a fishy news report? Some odd sort of artifact uncovered in a museum?"

"No," she said, smiling. "I saw a meteor falling out of the sky last night. I've had Mr. Smith tracking it. Speaking of – Mr. Smith, I need you!"

Mr. Smith burst forth from the wall with a hiss of steam and the reassembly of the "fireplace" he hid behind. His screen pulsed blue, red and purple, showing he was on, working, and awake. "Greetings, Sarah Jane, Clyde and Rani." he intoned mechanically. "How may I help?"

"Any updates on the meteor?" she asked.

"I have been tracking it all night," the Xylok replied, not without a hint of pride in his voice. "I also took the liberty of scanning the surrounding area and the unidentified object."

"I figured you would."

"It is located roughly seven miles from the city of Cardiff, in our direction." An image appeared on his screen of a map, with a single, blinking red blip, off on its own away from any cities or forests, in a flat field. "It is a very unique object, Sarah Jane. It crashed without making any sound or leaving an imprint, yet it was moving much too fast when it entered our atmosphere to land properly."

"So what is it?" Rani asked.

"It's not from our world," the computer replied.

Clyde snorted. "Well of course it isn't, it's alien! You feeling okay, Mr. Smith?"

"What I mean," it replied levelly, "Is that it's not from this Universe."

Sarah Jane frowned skeptically. "What, you mean it's from a parallel world?"

"That is my exact suggestion, Sarah Jane."

She rubbed her hands together, pacing the room. "Well... in that case, we have to retrieve it, in case it's dangerous. See what it does."

"Alright, I'll grab my backpack," Clyde said, and made for the door, but she shook her head.

"No, this could be really, really dangerous, you two. It's from another Universe, after all. We have no idea what it's capable of, and that's probably quite a bit, considering it can crash without a sound. I'm doing this one alone." As though it settled the matter, she reached across to her desk and pocketed her sonic lipstick.

"But Sarah Jane, we always come with you," Rani said, sounding crestfallen.

"Sarah Jane," Mr. Smith cut in suddenly. "If I may say, I do not think that's a very good idea. It may be good to have back up on this."

"Well certainly not kids!" she replied.

"Hey!" Clyde snapped. "I'm nearly 20."

"I am," Rani countered.

She shook her head. "No. I'll be fine on my own. Now you two go and... oh, I don't know. Just... Don't worry about me." She smiled. "I'm fine."

Rani saw Clyde open his mouth to protest and quickly said, "Alright, Sarah Jane. But you be careful. Clyde and I will go down and check out some shops. C'mon, Clyde."

They headed to the door and Sarah Jane sighed. "Thanks, you two."

"Are you sure this is the right choice, Sarah Jane?" Mr. Smith asked after a short pause.

She grabbed her coat as she headed towards the attic door. "I'll be fine. See you later."

The door clicked shut behind her.

I just want you to know my computer screen has a thin little crack in the shape of the Cracks in Time and Space.

DOCTOR! YOU MISSED A SPOT!