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.
Flash Gordon
Dr. Hans Zarkov
Mannequin
Police Sergeant at Jail (Uncredited)
End of the Trail
Sheriff Anderson
Flash Gordon Conquers the Universe
Dr. Zarkov
The Texas Rangers
Captain Stafford
The Prisoner of Shark Island
Mr. Holt
The Phantom
Professor Davidson
The Night of Nights
Frank, the Bartender (uncredited)
Flash Gordon's Trip to Mars
Dr. Zarkov
Purple Death from Outer Space
Dr. Zarkov
Blondes at Work
Capt. McTavish
Boomerang Bill
Terrence O'Malley
Torchy Runs for Mayor
Captain McTavish
Torchy Blane... Playing with Dynamite
Inspector McTavish
Wildcat Bus
Sweeney
Black Gold
Dan O'Reilly
Woman in the Dark
Prison Warden
Federal Fugitives
Hammond
A Burglar to the Rescue
The Burglar, Holtz aka Jack Dunning
Rawhide Rangers
McDowell
Ever Since Eve
Desk Sergeant (uncredited)
Next Time I Marry
Police Lieutenant (uncredited)
The Murder of Dr. Harrigan
Police Sergeant
Men Without Names
Agent Joe
Union Pacific
Old Man (uncredited)
The Ship That Died
Minor Role (uncredited)
Rocket Ship
Dr. Hans Zarkov
You Can't Take It with You
Mac (uncredited)
Torchy Blane in Panama
Captain McTavish
The Eagle's Brood
Mike
Torchy Blane in Chinatown
Police Capt. McTavish
Emergency Squad
Construction Supervisor at Elevator
Brigham Young
Second Man with California Gold News
The Return of Frank James
Sheriff
The Phantom
Professor Davidson
A Dispatch from Reuters
Mr. O'Malley - Captain of the Nova Scotian (uncredited)
The Prisoner of Zenda
Detchard
Road Gang
Chaplain (uncredited)
Over the Wall
Duke Slattery - Policeman with Warrant
The Bride's Play
Sir John Mansfield
Mars Attacks the World
Dr. Alexis Zarkov
Ten Gentlemen from West Point
Senator (uncredited)
The Secret Code
Police Commissioner
Icebound
Judge Bradford
The Perfect Set-Up
Detective Hewitt (uncredited)
The Adventurous Blonde
Captain McTavish
Torchy Gets Her Man
Police Captain McTavish (uncredited)
Batman
Dr. Hayden
Rulers of the Sea
Kelsey (Uncredited)
'G' Men
Police Chief at Lodge (uncredited)
Spaceship to the Unknown
Dr. Hans Zarkov (archive footage)
The Pace That Kills
Mr. Farley
A Dangerous Profession
Monsieur Beaucaire
Badger
Crack-Up
Train Station Gateman (Uncredited)
Flash Gordon: The Deadly Ray From Mars
Dr. Alexis Zarkov
Perjury
Phil Rourke
Peril from the Planet Mongo
Dr. Zarkov