Elon Musk also appeared as himself in episode 9.9, The Platonic Permutation (2015), of The Big Bang Theory (2007).
While young Sheldon is sitting in the comic book store, adult Sheldon (Jim Parsons) narrates that he has a fear of birds. He overcomes that fear in The Big Bang Theory (2007) with Lovey Dovey.
This episode was viewed by 12.11 million people and had a rating of 2.1 (adults 18-49).