Keir Dullea
Devon
Gay Rowan
Rachel
Lloyd Bochner
Col. M.P. Garoway
Carol Lazare
Navigator Teale
Diana Barrington
Janice
William Osler
Computer
Lillian Graham
Old Woman
Susan Fleming
Tech
Edward Andrews
Linus Farthing
Linda Sorensen
Doctor McBride
Allen Stewart-Coates
Computer voices
