Phineas and Ferb: Mission Marvel

 will be a special Season 4 episode of Phineas and Ferb and serve as an animated crossover between Disney and Marvel that will premiere in the summer of 2013.

Spider-Man, Iron Man, Thor and Hulk enter Danville after Dr. Doofenshmirtz's latest "inator" scheme accidentally removes their powers and immobilizes them. Now it's up to Phineas and Ferb to team up with the Marvel Super Heroes to help them regain their powers and defeat Marvel Super Villains – Red Skull, Whiplash, Venom and M.O.D.O.K. – who are working together with Dr. Doofenshmirtz to use his power-draining technology to create mayhem.

Perry's entrance to his lair
None.

Background Information

 * Disney has confirmed that this will be a crossover with Marvel, as formerly happened with the online game Club Penguin.
 * It will be the show's second one-hour special, following Phineas and Ferb: Summer Belongs to You!.
 * Dan Povenmire revealed in an interview that Doofenshmirtz creates the "power-drain-inator" with the intention of draining his brother's "power" as mayor of Danville, but it mistakenly hits Marvel's heroes. In the same interview, Jeff "Swampy" Marsh said that Candace's plot in the episode is going to involve her love to comic books and fan fiction.
 * This will be the first appearance of 'Spider-Man. Prior to this episode, he was parodied twice in the series canon ("Bowl-R-Ama Drama", "Phineas and Ferb Christmas Vacation!").
 * This is the first time Phineas and Ferb interact with Tony Stark/Iron Man.

Production Information

 * The storyboard of the episode's final act consists of 1801 pages.

Continuity

 * The Beak presumably appears again. ("The Beak", "Phineas and Ferb The Movie: Across the 2nd Dimension")
 * According to promo images, Candace reprises her Dangeraffe "secret identity", also from "The Beak".

Cast
The following are expected to be involved in the special:
 * Vincent Martella as Phineas Flynn
 * Ashley Tisdale as Candace Flynn
 * Thomas Sangster as Ferb Fletcher
 * Alyson Stoner as Isabella Garcia-Shapiro
 * Caroline Rhea as Mom
 * Dan Povenmire as Dr. Doofenshmirtz
 * Jeff "Swampy" Marsh as Major Monogram
 * Tyler Alexander Mann as Carl
 * Dee Bradley Baker as Perry the Platypus
 * Bobby Gaylor as Buford Van Stomm
 * Maulik Pancholy as Baljeet Tjinder
 * Kelly Hu as Stacy Hirano
 * Stan Lee as TBA (confirmed in Swampy's Tweet)
 * Additional voices: Dave Wittenberg, David Boat, Mark Hamill, Chris Cox
 * Drake Bell as Peter Parker/Spider-Man
 * Adrian Pasdar as Tony Stark/Iron Man
 * Travis Willingham as Thor
 * Fred Tatasciore as Dr. Bruce Banner/Hulk
 * Michael Gough as MODOK
 * Charlie Adler as Red Skull
 * Matt Lanter as Venom
 * Peter Kelamis as Whiplash
 * Clark Gregg as Agent Phil Coulson
 * Chi McBride as Nick Fury
 * Phil LaMarr as JARVIS
 * Dawn Olivieri as Pepper Potts