Yarrick was a Triannon male who was second-in-command to Pri'Nam D'Jamat. He was married to Indava. In November 2153, Yarrick came aboard the Earth Starfleet vessel Enterprise NX-01 following a faked distress call from his starship. Yarrick had doubts about D'Jamat's plan to hijack Enterprise, believing it was not right to repay kindness in such a way. After learning about his wife's pregnancy, and reluctant to bring a child into the world when it would just become another soldier, he eventually sided with Captain Jonathan Archer, helping him take back control of the ship.