Phineas, Ferb & Sonic: Adventure

Phineas, Ferb & Sonic: Adventure is the sequel to Phineas and Ferb meet Sonic the Hedgehog where Phineas, Ferb and a lot of other characters from the show head back to Mobius.

Chapter 1: Back to Mobuis
All of the parent characters of Phineas and Ferb are of on a vacation, so Phineas, Ferb and their friends choose to go to their favorite place Mobius to see Sonic and his crew. The best path the Warp Ring in Phineas and Ferb's backyard tree.

“Alright guys let's go!” Phineas yells before he sees Perry left.

Perry walked over to one of his many secret entrances to his secret lair hops in a hover car and flies to his nemesis’s place.

(♪Doofenshmirtz's Evil Incorporated♪) Perry left a note saying that he would be on Mobius for the next 4 weeks but ironically enough Doofenshmirtz, Norm and his daughter Vanessa were also heading for Mobius because Doofenshmirtz's old collage mate Dr. Eggman, Norm was coming because well he's a robot to, also he's a big fan of Metal Sonic.

They all jumped into the Warp Ring that he put a rug over it.

“Oh hi Perry. NOW let's go!” Phineas yells as he, Ferb, Candace, Isabella, Baljeet, Buford, Irving, Candace, Stacy,Jeremy, Shoutmon, Ballistamon, Dorulumon, Starmon, the Pickmons, Cutemon, Spadamon, Greymon, MailBirdramon, Deckerdramon, Sparrowmon and Mervamon jumped in. (The Digimon were told they could jump in with everyone else)

Phineas, Ferb, Shoutmon and everyone else lands in Green Hill Zone, but in the air, Shoutmon breaks the silence saying “Um, Phineas I hate to disturb you when your so relaxed but, were in the AIR!”, that's when Phineas and everyone else who was there the last remember that there in the air, that's when Phineas says “OH NO! I FORGOT!” a voice says “Don't worry!” everyone sees Tails on a brand new plane, everyone lands after Tails opens the top, Ferb then asks “What's this plane called?” Tails replies “!” they fly into Station Square to see everyone else from the last time they Phineas, Ferb and crew were there, but some new people are there, Knuckles, Shadow, Cream, and E-123 Omega.

(♪Robotropolis♪)

“Hi, Dr. Eggman, good to see you again!” Doofenshmirtz, tells his old collage room-mate Dr. Robotnik or as everyone seems to call him “Eggman” unlike the Phineas and Ferb crew the Warp Ring for Robotropolis, was on the ground.

Norm says “Hello, my name is Norm!” and Doofenshmirtz tells Eggman “Manly the only reason he came is to meet Metal Sonic.” a small footstep was heard and Metal Sonic appears. Norm walked up and says “I'm a real fan, can I have an autograph!” Norm pulls out an autograph book with Metal Sonic turning one of his hands into a pen he writes in “Metal Sonic”.

“Hey dad can we go to the city!” a voice says and Eggman replies “In a minute!” then tells his old collage roommate and his friends, “I built myself a son! I'll show you three to your rooms while your staying.

Even as a giant metallic, area on the inside, and what was seen in Sonic Unleashed (If that was Robotropolis) the inside of Eggman's HQ is very roomy. After giving Doofenshmirtz, Norm and Vanessa around he introduces them to Eggman Jr. a robot son he built a while back.

Eggman, Eggman Jr., and Doofenshmirtz hop in some Egg Mobiles, and left for Station Square to buy some video games.

Sonic began to run with Shoutmon, as one could see, all the characters were bonding. Ballistamon and Omega were have a slight battle, due to the fact Omega at first thought Ballistamon was a E series robot, but after Phineas and Shadow cleared it up they're having a friendly battle. As anyone could see, they're real friends already.