Dr. David Keel
John Steed
Carol Wilson
Harry Black
Claire
Mrs. Black
Jack Wickram
One-Ten
Billy Flowers
Maxie Lardner
George Milner
Madame Zenobia
Police Sergeant
Rosie
Puppy
One-Ten's Valet (uncredited)
Henchman (uncredited)
Crowdmember (uncredited)
Crowdmember in Tent (uncredited)
Man at Fair (uncredited)
Constable (uncredited)