Lee H. Katzin Director Patrick Duffy Mark Harris Actor Belinda Montgomery Dr. Elizabeth Merrill Actor Victor Buono Dr. Schubert Actor Dean Santoro Ernie Smith Actor Art Lund Admiral Dewey Pierce Actor Lawrence Pressman Commander Phil Roth Actor Mark Jenkins Lt. Ainsley Actor Allen Case Lt. Cmdr. Johnson Actor Joshua Bryant Dr. Doug Berkley Actor Steve Franken Doctor Actor Virginia Gregg Whale Scientist Actor Curt Lowens Emil Actor Charles Davis British Scientist Actor Lilyan Chauvin French Scientist Actor Vincent Milana American Scientist Actor Alex Rodine Russian Scientist Actor Philip Baker Hall George Actor Marguerite DeLain First Receptionist Actor Trudy Marshall Woman at Party Actor Michael J. London Popeye Actor Michael Watson Diver Actor Connie Izay First Nurse Actor Judd Laurance Intern Actor James Chandler Man on Beach Actor Patricia Anderson Second Receptionist Actor Robert H. Justman Producer