Robert Clarke

John Lawrence

Margaret Field

Enid Elliot

Raymond Bond

Prof. Elliot

William Schallert

Dr. Mears

Roy Engel

Tommy the Constable

David Ormont

Inspector Porter

Gilbert Fallman

Dr. Robert Blane

Pat Goldin

The Man from Planet X

Tom Daly

Donal, a searcher

June Jeffery

Wife of Missing Man