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.

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