Chapter 1:
The Warners were in their tower, trying to think of what to do.
"Good thing this is just a fanfiction," says Yakko, "'cause that means there's less pressure."
"Here's something," says Wakko, "a team of villains dedicated to ending our existance."
"I doubt that's ever going to happen," says Dot.
. . .
Meanwhile, in the mysterious swamp, a criminal mastermind is up to no good. Summoned together by a mysterious host, come thirteen of the most furious villains in the old show.
"So, who be the scurvy dog that summoned us here," asks Pirate Mel, "be it you?"
"Me," asks Dracula, "I had nothing to do vith this. As a matter of fact, the last thing I remember before coming here vas exploding. CURSE YOU, VARNER SIBLINGS!"
"Warner Siblings," asks Pa Bear.
"Warner siblings," asks Howie Turn.
"Warner Siblings," asks one of the Aliens in his language.
"Who are these Warner Siblings," asks Insidio.
"They're the most annoying creatures on the planet," says Ivan Bloski.
"They took me pirate property," says Pirate Mel.
"They disrupted my class," says Miss Flamiel.
"They fed me to my own dogs," says King Salazar.
"They took my garage," says Pa Bear.
"These warners sound alot like my archenemy, Emerald Light!"
"Anyone ever hear of Emerald Light," asks Ivan Bloski.
"No," says Pirate Mel.
"Or Insidio for that matter?"
"Of course you've heard of me, I'm Insidio, Master of the Universe! Or I would be if it weren't for that infernal Emerald Light!"
"Are you sure you've got the right building," asks Dracula.
"Never heard of you," says Ivan Bloski.
"Doesn't ring a bell," says King Salazar.
"You have been summoned for one purpose," says Buddy, "to destroy our common enemies, the Warner Siblings. You have all suffered at their hands."
We then see the times the Warners have annoyed them and the one time Insidio was beaten by Emerald Light.
"CURSE YOU EMERALD LIGHT!"
"That is why I have invited you to join The Legion of WB Doom!"
"Legion of WB Doom," asks Ivan Bloski.
"I wasn't going to say anything," says Pirate Mel, "but it does sound lame."
"How'bout we vote on a name," says the Alien in his language.
"I'm paying the rent on the secret lair," says Buddy.
"Wait, I was the movie villain," says Salazar, "maybe I should be the leader."
"I've known the warners longer," says Buddy, "and besides, this was my idea. The guy who assembles the villains is always the leader. Next order of business, lunch. How'bout a pizza?"
Everyone agrees to that as the evil base sinks to the ground.
The Members of the Legion of WB Doom:
Buddy
Ivan Bloski
Pirate Mel
Dracula
Pa Bear
Howie Turn
One of the Aliens
Miss Flamiel
King Salazar
Reeva (The Rita Parody)
Death
Satin
Insidio
This is noncannon to the Ultimate Advanceverse.