Fal-tor-pan

Fal-tor-pan was a Vulcan ritual designed to reunite a Vulcan's katra with his or her body.

This ritual was performed on Captain Spock in 2285 after he was recovered from the Genesis Planet by Admiral Kirk.

The ritual was considered very dangerous, both to the recovering deceased person, and to the keeper of the katra. For this reason, it was almost never performed, and at the time of Spock's fal-tor-pan, it was unclear whether the ritual had ever been performed at all. (Star Trek III: The Search for Spock)

A variant of this ritual was performed when the katra of Surak was inside Captain Jonathan Archer. (ENT: "Kir'Shara")

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In 2408 The Second officer T'Larah Sullivan and the Chief Security officer Chance Raschen of the USS Rosenante underwent the Fat-tor-pan in the Rosenante mission : Homecoming