Calla was a female Vissian who lived during the 22nd century. She was in charge of the microgravity lab on a Vissian starship.

She was married to a Vissian chief engineer, and they were planning on having a baby. Calla was part of the members of a delegation of Vissians that visited Enterprise NX-01 during a cultural exchange in 2153. Calla and her husband were accompanied by a Cogenitor, a third person needed by the Vissians for breeding. Calla became extremely angry when the Cogenitor, influenced by Trip Tucker, refused to return to their ship and sought asylum on the Enterprise. The Cogenitor was returned, but committed suicide, postponing Calla's hope of having a baby. (ENT: "Cogenitor")

Calla was played by Larissa Laskin.
In the final draft script of "Cogenitor", this character was commonly referred to as "Vissian Wife", even after her name of "Calla" was established.
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