The Hideous Sun Demon

Robert Clarke Dr. Gilbert McKenna

Patricia Manning Ann Russell

Nan Peterson Trudy Osborne

Patrick Whyte Dr. Frederick Buckell

Fred La Porta Dr. Jacob Hoffman

Peter Similuk George Messorio

William White Police Lt. Peterson (as Bill Hampton)

Robert Garry Dr. Stern

Donna King Suzy's Mother

Xandra Conkling Suzy

Del Courtney Radio Deejay

Ron Honthaner Policeman in Warehouse

Richard Cassarino Barfly / Man on Beach with Kids / Policeman (as Cass Richards)

Helen Joseph

Darryl Westbrook

Bill Currie