Wil Wheaton as Wil Wheaton – Then:
As the child star of Star Trek, Wil Wheaton was the perfect actor to play an exaggerated version of himself on "The Big Bang Theory." His entrance as a celebrity Sheldon had been dying to meet was played perfectly when he turned out to be less than kind, disappointing Sheldon so much that he became yet another of Sheldon's enemies, for a time at least. Though the two have seemed to set aside their differences now, it's not always easy being Sheldon's friend.
