Ex-Sabrina, the Teenage Witch star Melissa Joan Hart has joined the Fox comedy Dirtbags; House's Chi McBride has been cast in the Fox drama Deviant Behavior; 24's Leslie Hope has snagged a recurring role in ABC's Geena Davis vehicle Commander in Chief; and Napoleon Dynamite's Tina Majorino has come aboard ABC's untitled comedy starring The Station Agent's Peter Dinklage.