Guest Stars Lawrence Pressman as Commander Phil Roth Steve Franken as Doctor Allen Case as Lt. Commander Johnson Mark Jenkins as Lt. Ainsley Joshua Bryant as Dr. Doug Berkley Co Starring Philip Baker Hall as George Lilyan Chauvin as French Scientist Virginia Gregg as Whale Scientist Philip Tanzini as Boy at Phone Booth Alex Rodine as Russian Scientist Michael Watson as Diver Phillip Roye as Intern Maralyn Thoma as Second Nurse Larry Holt as Ambulance Driver Akemi Kikumura as Third Receptionist Patricia Anderson as Second Receptionist Robert Dore as Diver Trudy Marshall as Woman at Party Peter Weiss as Test Lab Assistant Marguerite DeLain as First Receptionist Cheryl Robinson as X-Ray Technician Michael J. London as Popeye Vincent Duke Milana as American Scientist Charles Davis as British Scientist Connie Izay as First Nurse Robert Phalen as Habitat Technician James Chandler as Man on Beach Judd Laurance as Intern Scott Stevenson as Boy on Beach Curt Lowens as Emil