William Shatner

Character: Admiral James T. Kirk

Leonard Nimoy

Character: Mr. Spock

DeForest Kelley

Character: Dr. Leonard 'Bones' McCoy

James Doohan

Character: Cmdr. Montgomery 'Scotty' Scott

George Takei

Character: Lt. Cmdr. Hikaru Sulu

Walter Koenig

Character: Lt. Pavel Chekov

Nichelle Nichols

Character: Lt. Cmdr. Uhura

Stephen Collins

Character: Captain William Decker

Persis Khambatta

Character: Lt. Ilia / The Probe

Majel Barrett

Character: Dr. Christine Chapel

Grace Lee Whitney

Character: CPO Janice Rand

Mark Lenard

Character: Klingon Captain

Billy Van Zandt

Character: Alien Boy

Roger Aaron Brown

Character: Epsilon Technician

Gary Faga

Character: Airlock Technician

Franklyn Seales

Character: Crew Member

Joel Kramer

Character: Klingon Crewman

David Gautreaux

Character: Cmdr. Branch

John Gowans

Character: Assistant to Rand

Howard Itzkowitz

Character: Cargo Deck Ensign

Jon Rashad Kamal

Character: Lt. Cmdr. Sonak

Marcy Lafferty

Character: Chief DiFalco

Michele Povill

Character: Lieutenant

Jeri McBride

Character: Technician

Terrence O'Connor

Character: Chief Ross

Michael Rougas

Character: Lt. Cleary

Susan O'Sullivan

Character: Woman

Ralph Brannen

Character: Crew Member

Ralph Byers

Character: Crew Member

Paula Crist

Character: Crew Member

Iva Lane

Character: Crew Member

Momo Yashima

Character: Crew Member

Jimmie Booth

Character: Klingon Crewman

Dave Moordigian

Character: Klingon Crewman

Tom Morga

Character: Klingon Crewman

Tony Rocco

Character: Klingon Crewman

Joel Schultz

Character: Klingon Crewman

Craig Thomas

Character: Klingon Crewman

Edna Glover

Character: Vulcan Master

Norman Stuart

Character: Vulcan Master

Paul Weber

Character: Vulcan Master

Joshua Gallegos

Character: Security Officer

Lisa Chess

Character: Yeoman

Leslie C. Howard

Character: Yeoman

Sayra Hummel

Character: Technical Assistant

Junero Jennings

Character: Technical Assistant

Bill McIntosh

Character: Klingon Crewman (as Bill McTosh)

Doug Hale

Character: Enterprise Computer (voice)

David Armstrong

Character: Enterprise Crew Member (uncredited)

Richard Arnold

Character: Crew Member (uncredited)

Rosanna Attias

Character: Enterprise Crew Member (uncredited)

Jerry Best

Character: Enterprise Sciences Crew Member (uncredited)

Christopher Doohan

Character: Extra (uncredited)