Admiral James T. Kirk

William Shatner

Commander Spock

Leonard Nimoy

Lt. Cmdr, Leonard H. 'Bones' McCoy, M.D.

DeForest Kelley

Cmdr. Montgomery 'Scotty' Scott

James Doohan

Capt./Cmdr. Willard Decker

Stephen Collins

Lieutenant Ilia / The Probe

Persis Khambatta

Lieutenant Ilia

Persis Khambatta

Sulu

George Takei

Lt. Cmdr. Uhura

Nichelle Nichols

Dr. Christine Chapel

Majel Barrett

Lt. Cmdr. Pavel Chekov

Walter Koenig

Klingon Captain

Mark Lenard

Lt. Cmdr. Janice Rand

Grace Lee Whitney

Alien Boy

Billy Van Zandt

Epsilon Technician

Roger Aaron Brown

Airlock Technician

Gary Faga

Crew Member

Franklyn Seales

Cmdr. Branch

David Gautreaux

Klingon Crewman

Joel Kramer

Assistant to Rand

John D. Gowans

Ltd. Cmdr. Sonak

Jon Rashad Kamal

Cargo Deck Ensign

Howard Itzkowitz

Assistant to Rand

John Gowans

Chief DiFalco

Marcy Lafferty

Technician

Jeri McBride

Lieutenant

Michele Ameen Billy

Chief Ross

Terrence O'Conner

Lieutenant

Michele Povill

Lt. Cleary

Michael Rougas

Chief Ross

Terrence O'Connor

Woman

Susan O'Sullivan

Crew Member

Ralph Brannen

Crew Member

Ralph Byers

Crew Member

Paula Crist

Crew Member

Iva Lane

Crew Member

Momo Yashima

Klingon Crewman

Jimmie Booth

Klingon Crewman

Dave Moordigian

Klingon Crewman

Tom Morga

Klingon Crewman

Tony Rocco

Klingon Crewman

Joel Schultz

Klingon Crewman

Craig Thomas

Vulcan Master

Edna Glover

Vulcan Master

Norman Stuart

Vulcan Master

Paul Weber

Security Officer

Joshua Gallegos

Yeoman

Lisa Chess

Yeoman

Leslie C. Howard

Woman

Susan Sullivan

Technical Assistant

Sayra Hummel

Technical Assistant

Junero Jennings

Extra (uncredited)

Christopher Doohan

Chief DiFalco

Marcy Brown

Doug Hale

Klingon Crewman

Bill McIntosh

Director

Robert Wise