Across the Other Dimension

Summary
When Phineas, Ferb, Danny Fenton, Peter Parker, Candace and Perry follow Dr. Doofenshmirtz through his "Otherdimensionator", they find themselves in an alternate universe where a second, truly evil Dr. Doof rules over his Tristate Area with an army of iron-fisted robots. To save his friends from certain doom, Perry makes the ultimate sacrifice by revealing his secret identity as Agent P. Phineas and Ferb escape, meet their 2nd dimension selves, and begin their own mission to rescue Perry. But in Dr. Doof's universe, Peter Parker has his alien symbiote costume, and has defeated Dr. Doof and Destroyed the Platyborg, and has taken over Alt. universe Danville.

As they uncover his plot to travel back to their dimension to take over their World, the gang, as well as their alter-egos, must band together to stop him.

So begins an epic battle as our heroes try to save their home from the clutches of Evil Peter Parker/Spider-Venom! Will Spider-Venom succeed and achieve dual world domination? Will Candace finally bust her brothers? Find out in this action-packed, epic adventure - so huge that it crosses over time and space.