- Before her stardom, Barbra Streisand was Dennen's live-in lover in New York City. Their turbulent personal relationship - and Dennen's inarguable influence on her early singing career - is documented in biographies of Streisand and in Dennen's own memoir "My Life with Barbra: A Love Story" (Prometheus Books, 1997).
- Once lived with Barbra Streisand.
- Best known for his oily villainy on both the Broadway and London stage ("Cabaret," "Jesus Christ Superstar").
- He was bullied as a child, describing himself in an interview as "pick-on-able". He got beaten up every day after school and would be held in a hammer lock until he started to cry.
- Along with Adam West, Roddy McDowall, Bob Hastings, Steve Franken, Michael Pataki and Judy Strangis, he is one of only seven actors to appear in both Batman (1966) and Batman: The Animated Series (1992).
- He has appeared in three different series about Batman: Batman (1966), Batman: The Animated Series (1992) and Batman Beyond (1999).
- UCLA graduate.
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