John Ross Bowie as Barry Kripke – Then:
Barry Kripke established himself from the get-go as one of Sheldon's many nemeses from his first introduction in season two, aside from constantly antagonizing the gang as a rival physicist, though one who studies plasma and string theory, Barry is still beloved for his sarcastic quips that are always punctuated by the speech impediment that prevents him from properly pronouncing his right name.
