One of Our Spies Is Missing 1966
as Fleeton
One Spy Too Many 1966
as Ingo Lindstrum
Jesse James Meets Frankenstein's Daughter 1966
as Hank Tracy / Igor
Captain Newman, M.D. 1963
as Patient at Mental Ward (uncredited)
Heller in Pink Tights 1960
as Goober
Credits from TMDB.