Tavin was a male Vulcan who lived during the mid-22nd century. He was a member of the V'tosh ka'tur, a sect of Vulcan society that did not believe in repressing their emotions, but instead reintegrating them back into their psyche.

Tavin left the planet Vulcan in 2143, becoming captain of the Vahklas, a Vahklas-type transport.

In 2151, he encountered the Earth starship Enterprise NX-01. Captain Archer invited him aboard for dinner and was amazed by Tavin's pleasant behavior. Tavin explained that he and his shipmates were on a quest to explore feelings and to balance emotions and logic. During dinner, they discussed this concept and enjoyed the food, even eating meat. He also requested Chef's recipe for chicken marsala. (ENT: "Fusion")

Tavin was played by Robert Pine, Chris Pine's father.
As established in the first draft script of "Fusion" (which had the working title "Equilibrium"), this character's name was originally to have been "Tyrus". Also in the episode's script (both the first draft and the final draft), Tavin was described as "A Vulcan man with slightly graying hair [....] But he looks very different from any Vulcan we've met... his hair is styled differently, and his clothes are more casual. For a Vulcan, Tavin is uncharacteristically friendly."
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