Frank Shannon was an Irish-born stage and screen performer. He had his film debut in The Prisoner of Zenda (1913). He is most fondly remembered as the brilliant Dr. Zarkov in the three Flash Gordon serials.
as Dr. Zarkov
as Dr. Hans Zarkov (archive footage)
as Train Station Gateman (Uncredited)
as Prof. Davidson (uncredited)
as Professor Davidson
as Dr. Hayden
as Police Commissioner
as Senator (uncredited)
as McDowell
as Hammond
as Mr. O'Malley - Captain of the Nova Scotian (uncredited)
as Second Man with California Gold News
as Sweeney
as Sheriff
as Dr. Zarkov
as Construction Supervisor at Elevator
as Frank, the Bartender (uncredited)
as Kelsey (Uncredited)
as Inspector McTavish