Sopek was a Vulcan officer and the captain of the Vulcan ship Ni'Var in the early 2150s. Sopek was the senior Vulcan officer in Coridan's sector and was accordingly kept under close surveillance by the Andorian Imperial Guard.
In 2151, the Vulcan High Command sent Sopek to transfer T'Pol off Enterprise NX-01 and back to Vulcan due to her role in the destruction of the sacred Vulcan monastery of P'Jem. After T'Pol and Captain Jonathan Archer were abducted by one of the many rebel factions on Coridan, Sopek led a heavily-armed landing party to rescue them, unaware that Enterprise crewmembers, with the help of Andorian officers Shran and Tholos, were conducting a rescue mission of their own.
After Archer and T'Pol were rescued, rebel leader Traeg attempted to shoot Sopek. T'Pol pushed Sopek out of harm's way, taking the shot herself. As T'Pol recovered from her injury, Archer convinced Sopek to ask the High Command to reconsider her transfer in light of recent events. (ENT: "Shadows of P'Jem")