Trevix was a Denobulan geologist for the Denobulan Science Academy.
In late 2152, she was assigned to a team lead by Dr. Yolen to Xantoras to study unique rock formations there. The three of them climbed through maze-like tunnels to get to where they set up their base, and left sample containers throughout the caves.
In February of 2153, a xenophobic faction took over the Xantoras government and demanded that all aliens leave the planet. The scientists were too far underground to receive the message, and as the nearest Denobulan starship was several days away, the Denobulan government asked Enterprise NX-01 to retrieve Trevix and her team. She and the other two scientists were reluctant to leave. Trevix believed the Science Academy didn't appreciate their work enough.
She was willing to travel back to Denobula on a transport ship with an Antaran, against whom her people held many prejudices. (ENT: "The Breach")
