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)

Milton Rosmer