Seymour Hicks
Professor Heggie
Nancy O'Neil
Angela Heggie
Gibson Gowland
Angus
Frederick Peisley
Jimmy Andrews
Eric Hales
Jack Campbell
Ben Field
Piermaster
Hubert Harben
Prof. Blenkinsop Fothergill
Rosamund John
Maggie Fraser
Robb Wilton
Reporter
Fewlass Llewellyn
Scientist at Meeting
Stafford Hilliard
Macdonald (Uncredited)
Cyril McLaglen
Mate (Uncredited)
Clive Morton
Reporter (Uncredited)