George Maharis
— Peter Santelli
Robert Morse
— Oliver Cromwell Cannon
Anjanette Comer
— Tiara Marshall
James Gregory
— Vice Admiral
Michael Constantine
— Mikhail Drozhensky
Howard St. John
— Harvey T. Sweigert
Norman Fell
— George Snell
Janine Gray
— Diana Grenville-Wells
Bernard Fox
— Leslie Folliott
Richard LePore
— Ben Livingston
Conlan Carter
— Orville Bayleaf
Yvonne Craig
— Sharon Sweigert
Doodles Weaver
— Ham Operator
Pat Priest
— Stewardess
Frank London
— Shaggy Type