Peter Millard

as Shirtless Grandpa

as Professor Stokeld

as Lester Majak (7 episodes)

as John B.

as Albert (1 episode)

as Anton

as King of Nordin

as Russell Fuller (1 episode)

as Gene Nelson (1 episode)

as Mr. Roth (1 episode)

as Superintendent (1 episode)

as Dr. Fain

as (uncredited)

as C.B.S. Engineer

as Bunden

as Mr. Munro (1 episode)