Bob Marriott
Lucy Byrne
Professor Sewell
Alan Andrews
Sir George Gatling
Mr. Prince
Brown
Arthur
Dr. Shole
Levers
Parkin
Dr. Childs
Director
Slater
Iverson
Mr. Prince's Secretary
Phil - the Barman
Pin-Table Man
Teddy Boy
Rosson
Heller (as Andre Charise)
Scientist (uncredited)
Man at Ceremony (uncredited)
Man in Cinema (uncredited)
Man in Pub (uncredited)