Robert Downey Jr. may soon goose the genre that launched his comeback. The Iron Man star is in negotiations to voice a character in Master Mind, DreamWorks Animation’s send-up of the superhero genre being produced by Ben Stiller’s production company, Red Hour Films. Tina Fey is also expected to join the cast of the movie, about a villain who loses his will to live after accidentally killing his archrival. Neither actor is a newcomer to animation: Downey Jr. lent his voice to an episode of Family Guy and the Richard Linklater film A Scanner Darkly, while Fey voiced a burrito in the film version of Aqua Teen Hunger Force. Master Mind (the working title for now) is based on a script from Alan Schoolcraft and Brent Simons and will be directed by DreamWorks Animation veterans Cameron Hood and Kyle Jefferson. One request, guys: no references to Stiller’s failed 1999 superhero spoof Mystery Men. The world does not need more Mr. Furious.