This is A Phineas and Ferb movie where Sonic lands in Phineas and Ferb's world. Meanwhile Doofenshmirtz meets Eggman. Then Tails and Perry the Platypus team up to beat them.
Phineas and Ferb theme song (Today Is Gonna Be A Great Day)
Sonic X theme song (Gotta Go Fast)
Perry the Platypus theme
Gitchee Gitchee Goo (rock version)
Eggman theme song (E.G.G.M.A.N)
Doofenshmirtz Evil Inc jingle
Tails the Two Tailed Fox theme (tune to Perry the Platypus theme) during end credits
When Doofenshmirtz tells his backstory it is not too long ago becuase it is about Doofenshmirtz and Eggman meeting when traveling through worlds
The idea came becuase Phineas and Ferb is a great show and so is Sonic X!
Sonic the Hedgehog
Miles "Tails" Prower
Knuckles the Echidna
Cream the Rabbit and Cheese'
Chris Thorndike (Sonic X)
Dr. Heinz Doofenshmirtz
Dr. Ivo Robotnik (Eggman)