In the sci-fi adventure STAR TREK (NBC/1966-69), Vulcan Science Officer Spock (Leonard Nimoy) had a different blood color from the rest of the human crew on the Starship Enterprise. It was specifically stated that Mr. Spock's blood was the color green. Mr. Spock's blood was green because the oxidizing agent in Vulcan blood is copper. Regarding human beings, they have iron as an oxidizing agent.

The specific facts about Mr. Spock's blood are revealed on the television episode "Journey to Babel". When Spock's Vulcan father, Ambassador Sarek (Mark Lenard) suffers a heart attack that requires surgery, he needs a life-giving transfusion of T- Negative blood from Spock.

Initially, Spock refuses to donate blood because a knife attack had put Captain Kirk (William Shatner) out of action. Spock was put in command of the ship. Logic dictated his responsibility to command the Enterprise outweighed taking time out from a crisis to give his father blood.

In the end, he gave the blood because Captain Kirk faked recovery and returned to the bridge. Thus, Spock was free to go to the sickbay and assist in his father's surgery.

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