Across six episodes of "The Big Bang Theory," Bob Newhart joined the main cast as Arthur Jeffries, a hero of Sheldon's who goes by the stage name "Professor Proton." Newhart — who was greeted ...
Johnny Galecki made Leonard Hofstadter one of The Big Bang Theory's most lovable characters, but he wasn't the only one up for the role — and luckily, one of actors who lost out ended up winning a ...