Michael Murphy
James R. Lesko
Helen Horton
Mildred Eldridge
Nigel Davenport
Dr. Ernest D. Hubbs
Lynne Frederick
Kendra Eldridge
Alan Gifford
Mr. Eldridge
David Healy
Radio Announcer (voice) (uncredited)
Robert Henderson
Clete
Cast of Phase IV
Michael Murphy
James R. Lesko
Helen Horton
Mildred Eldridge
Nigel Davenport
Dr. Ernest D. Hubbs
Lynne Frederick
Kendra Eldridge
Alan Gifford
Mr. Eldridge
David Healy
Radio Announcer (voice) (uncredited)
Robert Henderson
Clete