Sarah Michelle Gellar joins Robin Williams pilot at CBS

"Buffy the Vampire Slayer" Sarah Michelle Gellar is eying a small screen return with a very high profile pilot.   According to a variety of media reports -- we'll cite The Hollywood Reporter -- Gellar has joined CBS' "Crazy Ones," a single-camera workplace comedy starring Robin Williams.   Set in the world of advertising, "Crazy Ones" focuses on advertising legend Simon Roberts(Williams) and his daughter Sydney (Gellar), creative director at his agency. The project also features "Political Animals" and "Lone Star" leading man James Wolk.   Not enough starpower for you? "Crazy Ones" was written by David E. Kelley and »