Assignment: Earth

William Shatner

James T. Kirk

Leonard Nimoy

Spock

DeForest Kelley

Dr. McCoy

James Doohan

Scott

Walter Koenig

Pavel Chekov

George Takei

Sulu

Nichelle Nichols

Uhura

Teri Garr

Roberta Lincoln

Roger Holloway

Lt. Lemli (uncredited)

Robert Lansing

Gary Seven

Don Keefer

Cromwell

April Tatro

Isis - human form

Eddie Paskey

Lieutenant Leslie (uncredited)

Edwin Rochelle

Man With Newspaper (uncredited)

Esther Ying Lee

Pedestrian (uncredited)

Ken Kane

Workman (uncredited)

Bob Johnson

Ground Control (voice) (uncredited)

Rudy Doucette

Staff Member (uncredited)

Frank da Vinci

Lt. Clifford Brent (uncredited)

Robert D'Arcy

Pedestrian (uncredited)

Bill Blackburn

Lieutenant Hadley / Rocket Base Technician (uncredited)

Barbara Babcock

Beta 5 Computer / Isis (voice) (uncredited)

Paul Baxley

Security Chief

Ted Gehring

Second Policeman

Bruce Mars

First Policeman

Morgan Jones

Col. Nesvig

Lincoln Demyan

Sergeant