DreamWorks Animation has handed Seth Rogen (Green Hornet) its lead ghost post. The Funny People star, who voiced the blobby B.O.B. in Monsters vs. Aliens and the martial arts-trained Mantis in Kung Fu Panda, has been cast to voice a lead character in the studio’s Boo U. The comic story centers on a ghost who must return to ghost school to learn how to be a better spook. Igor director (guh) Tony Leondis is directing the 3D project.