The Big Bang Theory re-invented the sitcom genre in many ways and broke free from the ideals set by its predecessors.

F rom 'Star Trek' actors like William Shatner to science experts like Stephen Hawking, The Big Bang Theory has been host to a wide array of guest stars, including Sara Gilbert, who played Leslie ...

Other memorable appearances include Mark Hamill, Stephen Hawking, Stan Lee, and William Shatner. Here, we’ve listed 10 other great celebrity appearances in The Big Bang Theory that you may well ...

"The Big Bang Theory" shines a spotlight on nerd ... and Sheldon wants in on the action. William Shatner kicks off the episode by talking to Sheldon and Amy on the children's show "Professor ...