The Crossover Adventure!

is created by Christinahorst.2018. Nikki eventually returns to Danville, but with some bad news: Doofenshmirtz is going to blow up the world! Phineas didn't think he, Ferb, Nikki, Isabella, Buford, Baljeet and Perry made a big enough team, so the characters of Total Drama, SpongeBob SquarePants, The Powerpuff Girls, and Fanboy and Chum Chum help. Can they all defeat Doofenshmirtz and save the world?

Story
Phineas and Ferb were thinking of what to do. But Nikki hurries through the gate. "Hi, Nikki!" said Phineas. He hugged her and continued, "I'm so glad you're back!" Then, Phineas let go of her. "Well, hi, Phineas. Listen, I've got some bad news," said Nikki. "This guy named Doofenshmirtz is going to blow up the world and we need to stop him!" Perry chattered and turned into Agent P. Isabella, Buford and Baljeet walked in. "Hi, Phineas! Whatcha doing?" said Isabella. "Some guy named Doofenshmirtz is going to blow up the world, and we need a team!" said Phineas. "Aren't we a big enough team?" said Buford. Ferb shook his head no and said, "We need a bigger team." Phineas said, "Right!" Owen, Gwen, Heather, Duncan, LeShawna, Geoff, Izzy, DJ, Lindsay, Bridgette, Trent, Eva, Harold, Courtney, Sadie, Beth, Cody, Tyler, Katie, Justin, Noah, Ezekiel, Alejandro and Sierra from Total Drama, SpongeBob, Patrick, Squidward, Mermaid Man, Barnacle Boy, Sandy and Pearl from SpongeBob SquarePants, Blossom, Bubbles and Buttercup from The Powerpuff Girls and Fanboy, Chum Chum, Kyle, Yo, Lupe and Lunch Lady Cram from Fanboy and Chum Chum arrived. "We all heard you needed a bigger team, so we came immediately," said Bubbles. "Wow, that was fast," said Baljeet. "Come on, we better go save the world from that EEEEEEEEEVVVVVVVVVVVIIIIIIIIIIIILLLLLLLLLLLLLLLLL!" said Mermaid Man. Barnacle Boy said, "Not again. Let's just go!" Everyone left.

At Doofenshmirtz Evil Inc., Doof said, "Okay, let's put the finishing touches on our new rocket!" "You mean your new rocket. And I can't believe you got me into this!" said Vanessa. "Not really," said Phineas. He, and the rest of the team, have arrived. "You all are too late!" said Doof. TBC