Production is now underway on Phineas and Ferb: Mission Marvel, an animated adventure that will assemble characters from two hugely popular franchises, Disney's Phineas and Ferb and Marvel's iconic Super Heroes:  Spider-Man and The Avengers (Iron Man, Thor and Hulk).

The epic television event, premiering in summer 2013 on Disney Channel, will mark the first crossover animated television special for Marvel and Disney properties. Working closely with Marvel's creative team, Phineas and Ferb creators and executive producers Dan Povenmire and Jeff "Swampy" Marsh are designing Marvel's Super Heroes and Super Villains including Red Skull, Whiplash, Venom and M.O.D.O.K. to fit the Danville world of the Emmy Award-winning series.

Check out the video, below, from the Phineas and Ferb panel at Comic Con 2012, where the announcement was made:

Source: Disney Channel