Identity transference

Identity transference was the swapping of minds between two bodies.

Ten thousand years ago on Vehtora IV, the native Dhauti civilization planned to transfer their identities into the Xhosa species, but their creations rebelled and killed them all. (TOS - Unlimited comic: "As Flies to Wanton Boys")

On Phylos, Stavos Keniclius developed a process which could transfer a subject's mind into a machine. (TAS episode: "The Infinite Vulcan")

In 2152, identity transference technology was discovered in the Eris Alpha system. (ENT novel: What Price Honor?)

In 2267, Romulans on Tondus planned to use identity transference equipment to replace USS Enterprise officers with doubles. (TOS comic: "The Marshall Plan") Later, the Varkans planned to transfer their identities into machines on Earth and destroy the Human civilization. (TOS comic: "Thorpex") Later, Gokron and Chekra of Plixes disguised themselves as Captain James T. Kirk and Spock by using identity transference equipment to copy their bodies and memories. (TOS comic: "To Rule the Universe")

In 2269, identity transference technology was discovered on Camus II. It was used to transpose the life energy of Captain Kirk and Janice Lester. (TOS episode & Star Trek 5 novelization: Turnabout Intruder)

In 2270, a transporter malfunction caused by pulsar damage transposed the personalities of Kirk, Spock, Hikaru Sulu and Nyota Uhura: Kirk was in Sulu's body, Spock was in Uhura's body, Sulu was in Spock's body, and Uhura was in Kirk's body. (TAS - Log Ten novelization: The Slaver Weapon) Later, Kirk swapped bodies with Shaun Geoffrey Christopher. (TOS novel: The Rings of Time)

In 2365, Katherine Pulaski's identity was transferred into an android body. (TNG short story: "Pulaski 2.0")

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