Variety reports that Will Ferrell, Brad Pitt and Jonah Hill have joined a cast led by Tina Fey to lend their voices for Dreamworks Animation’s upcoming feature Oobermind. Ferrell reportedly replaces Robert Downey Jr. in the title role of a supervillain in the animated comedy. Produced by Lara Breay and Denise Nolan Cascino and directed by Tom McGrath, Oobermind is set for a fall 2010 release.