Robin Williams became an instant sensation back in 1978 as a lovable alien on the hit TV show "Mork and Mindy", based on a character he introduced on another hit show, "Happy Days". He then created a number of memorable big screen characters in films like "Mrs. Doubtfire", "Patch Adams" and "The Birdcage". Now he is returning to the small screen this fall in a new CBS comedy. "The Crazy Ones". Check out the preview.