Walter Koenig

Like most cast members of the TV series Star Trek, Walter Koenig seems permanently linked with the show. He played Ensign Pavel Chekov, the Russian among the cast's multi-ethnic crew. Later he scored on another sci-fi TV show, playing Psi cop Alfred Bester on the 1990s series Babylon 5. In 1998 he published his autobiography, Warped Factors: A Neurotic's Guide to the Universe.

Extra credit: Koenig's co-stars on Star Trek included William Shatner as Captain Kirk, Leonard Nimoy as Mr. Spock, and DeForest Kelley as Dr. McCoy... Pre-Trek, Koenig was a guest star on the TV series Ben Casey.