- For other uses, see Thorsson.
Thorsen was a crewmember aboard the Federation starship USS Endeavour in the 23rd century.
In 2268, Thorsen was on the bridge at the navigator's console during an altercation with the Tholians in the Eremar system. At Captain Atish Khatami's command, Thorsen served as the tactical officer, operating and reporting on shields, phasers and photon torpedoes. (VAN novel: Storming Heaven)