Michael Pataki Director Richard Basehart Dr. Leonard Chaney Actor Gloria Grahame Katherine Actor Trish Stewart Nancy Chaney Actor Lance Henriksen Dr. Dan Bryan Actor Al Ferrara Dr. Dan Bryan Actor JoJo D'Amore Georgio Actor Donna Andresen Sylvia Porter Actor Marilyn Joi Miss Mathews Actor Katherine Fitzpatrick Elevator Victim Actor Katherine Stewart The Hitchhiker Actor Vic Tayback Detective Simon Actor Simmy Bow Ambulance Doctor Actor Arthur Space Wino Actor Del Negro Black Intern Actor Sally Marr Landlady Actor Sandy Champion Doctor in Corridor Actor Patsy Sublime Miss Dunn Actor Barbara Sloane Woman Bystander Actor Charles Band Producer Frank Ray Perilli Writer