George uses "Star Trek" because it's pretty much the only shared language he has with his son, something we see again when Sheldon imagines his father saying goodbye a'la Spock (Leonard Nimoy ...

Perhaps his best appearance on the series was a voiceover cameo in which he gave Sheldon (Jim Parsons) advice in the form of a tiny Spock action figure. In the season 5 episode, Sheldon and ...