He sang a song about Bilbo Baggins—and made a video for it.
He wrote an autobiography called I Am Not Spock, and then wrote a sequel called I Am Spock.
He starred in a Bangles video.
He voiced Galvatron in Transformers: The Movie.
He had a cameo on The Twilight Zone.
He helped fund the renovation of the Thalia theater in New York.
He directed Three Men and a Baby.
He voiced a long-running Boston Museum of Science Mugar Omnitheater intro.
He was sampled in an Information Society hit.
He played Spock.