Hey guys, I'm back at it again with yet another Animaniacs crossover story. This one is something I've wanted to do since I discovered the game Undertale, as I think the Warners would get along really well with the monsters of the Underground. I'll be changing a few events from the game to tie things in better with the plot, but they will be very minimal. Anyway, sit back, relax (or be on the edge of your seat, whichever you prefer), and enjoy the story.

The sun shone brightly on the Water Tower in the Warner Bros. Movie Lot. Of course, as most people know, it was the home of none other than the Warners. They opened the door, looking out at their surroundings. They jumped out with huge grins on their faces and backpacks on their backs. Before they could land on the ground, they pulled cords attached to their backpacks, releasing parachutes. They skyrocketed back up to the peak of the tower, then slowly and gently made their way down, their parachutes covering their bodies. They lifted their parachutes up and looked at the readers.

"Way to make an entrance, huh?" said Yakko.

He whistled, catching Ralph's attention. The fat, dumb security guard ran at them with a net. Yakko effortlessly slid through Ralph's legs as Wakko pulled his hat down, rendering him unable to see. Dot tapped his shoulder, which made him lower his net...on himself. The Warners gave each other high-fives and ran off.

"So," said Yakko, "whaddya wanna do today?"

"I dunno," said Wakko.

"Hey," said Dot, "why don't we go through one of the rabbit tunnels?"

"Good idea," said Yakko, "we haven't used them in a while."

They dug a hole and went through one of the many rabbit tunnels underground, a-la Bugs Bunny. After many hours, they finally reached the end. Yakko climbed out, followed by Wakko and Dot.

"Glad that's over," said Dot. "We would've gotten here faster if it wasn't for Wakko's potty emergencies!"

"I couldn't hold it in!" he retaliated. "Where are we anyw-"

"Shhhhhh!" said Yakko, looking around.

They seemed to be in a forest or some kind of wilderness area, but it radiated a peculiar aura. Yakko's eyes shifted from one tree to another, checking out the strange new environment he and his siblings stumbled upon.

"What?" said Dot.

"Listen. That distant background music...somethin' tells me we're in video game territory! Computer video game, to be specific."

"Would ya look at that?" said Dot. "Not a single cursor in sight!"

She let out a sigh of relief, remembering how awful it felt to be controlled by a random player in computer game territory. She was also relieved that their designs didn't change into one of the weirder bitmap ones.

"Looks like we're the players," said Wakko. "But where do we start?"

Yakko turned around and saw a large mountain.

"How about that mountain?"

They walked towards it, finding out that the closer they were, the louder the background music became. Obviously it meant they were supposed to go there. Upon approaching, The Warners saw a sign at the bottom of the mountain, which read Mt. Ebott. Yakko shrugged and started climbing, his siblings following closely behind him. As they continued climbing the mountain, they saw various different signs and took turns reading them. The first one showed a picture of a short-haired human, wearing a large poncho and holding a spear while standing next to an anthropomorphic goat-like creature, who was wearing a robe.

"Long ago," Yakko read, "two races ruled over Earth: HUMANS and MONSTERS."

The next sign showed a picture of the same human, holding their spear in front of a larger goat. This goat, however, wore a crown and a cape, signifying it was a king. King of the monsters, that is. He also had horns sticking out of his head and held a trident. Both the human and the monster had a crowd of other humans and monsters behind them.

"One day," Wakko read, "war broke out between the two races."

The following sign showed a picture of monsters looking up at the humans.

"After a long battle," Dot read, "the humans were victorious. They sealed the monsters underground with a magic spell."

The last sign had no picture.

"Legends say that those who climb the mountains never return," Yakko read. "Hmmm, sounds kinda dangerous...we should keep goin'!"

"Yeah!" Wakko and Dot cheered in agreement.

Finally, they reached the top.

"Whoa..." said Yakko.

"Faboo!" said Wakko.

"Ya got a great view from up here!" said Dot.

They knelt in front of a large hole at the top of Mount Ebott. Looking down, there was nothing but darkness.

"Hello?" Yakko called out, but he only heard his own echo.

"Anyone down there?" Wakko called, also hearing nothing but his echo.

He leaned in closer, trying to get a better look. Suddenly, he tripped over a vine. The ground also gave away beneath Dot, sending both of them falling down the hole screaming.

"SIBS!" Yakko screamed.

He leaned forward and tried to grab them, but he missed. Unfortunately, he also lost his balance and screamed as he fell with his siblings. After a few seconds, they landed on the ground, which was surprisingly comfortable. Yakko was on his stomach, Wakko on his back, and Dot on her side. Yakko got up off the ground first, brushing the dust off his slacks.

"Ya guys ok?" he said, helping Wakko and Dot up.

"Yeah," said Dot, "we're fine."

"Good thing those golden flowers broke our fall," said Wakko.

Yakko looked down and saw that they were indeed standing on golden flowers.

"No wonder that landing wasn't so bad."

They looked up, trying to see the top of the mountain. However, it led to nothing.

"Wakko," said Yakko, "ya got the plot holes?"

Wakko reached into his Gag Bag and tried to take out the plot holes so they could get out of the hole. But he couldn't find them, which he showed through his slightly panicked facial expression.

"Oh no," said Dot. "Ya left them at home, didn't ya?"

"No," said Wakko, "I swear I put 'em in here before we left!"

This meant only one thing: the Warners were trapped underground.

"Oh well," said Yakko, shrugging it off. After all, what was he supposed to do about it?

He looked down a long hallway that led to the rest of the Underground.

"Looks like we'll have to keep movin' forward."

They walked down the hallway and through a large door-shaped hole. And that's how their adventure began.