Who are some of your favorite cameos on The Big Bang Theory? Watch The Big Bang Theory on TBS. Check out Part 1: youtu.be/s8gB-g4n6Bk Celebrity guest stars in this video: Bill Nye, William Shatner, Wil Wheaton, Kareem Abdul-Jabbar, Kevin Smith, Joe Manganiello, Adam West, Bill Gates, and Neil DeGrass Tyson. #TBS #TheBigBangTheory #JimParsons #JohnnyGalecki #KaleyCuoco #SimonHelberg #KunalNayyar #BillNye #WilliamShatner #WilWheaton #KareemAbdulJabbar #KevinSmith #JoeManganiello #AdamWest #BillGates #NeilDeGrassTyson SUBSCRIBE: bit.ly/TBSSub Download the TBS App: bit.ly/1qBbkMW About The Big Bang Theory: Leonard and Sheldon are brilliant physicists, the kind of ''beautiful minds'' that understand how the universe works. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door. Starring Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, May...