Calla
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  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 , 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. ()

cs:Calla
Vissians
Scientists