After Chekov, Koenig had a recurring role as Psi Cop Alfred Bester on the television series "Babylon 5". He was a "Special Guest Star" in twelve episodes and, at the end of the third season, the production company applied for an Emmy nomination on his behalf. He was slated to play Bester on the spin-off series "Crusade", but the series was cancelled before his episode was filmed. The character name of "Alfred Bester" was an homage to the science-fiction writer of the same name.