Ensign Carstairs was a 23rd century Starfleet geologist serving aboard the USS Enterprise.
In 2268, Carstairs was still on his first tour of duty. He was selected to be in the landing party to Alpha Carinae II by the M-5 multitronic unit but not by Captain Kirk. This was because M-5 knew that Carstairs had once visited the planet while being with the Merchant Marines. (TOS: "The Ultimate Computer")
This character was only mentioned in dialogue.
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