“Oobermind,” the new animated comedy from DreamWorks Animation, has signed three new voices; Will Ferrell, Brad Pitt, and Jonah Hill.

Robert Downey Jr. was originally attached to play the title role of a supervillain who ruminates about all his nefarious dreams coming true after defeating his superhero rival, Metro Man (Pitt), only to discover life to be quite boring without an adversary. Ferrell will replace Downey as the star. Hill will play Titan, a new superhero Oobermind creates to fill the void, but also wants to be bad, forcing Oobermind to then switch sides and become good.

Tina Fey, already on board, will play the reporter responsible for making sense of the city’s bewildering superhero situation.

Flick will be produced by Lara Breay and Denise Nolan Cascino, and directed by Tom McGrath (“Madagascar”).

DWA has set “Oobermind” for a fall 2010 release.