Fenson, a Rendili man of Human descent and male sex, was employed by the Galactic Empire. As an Imperial Navy trooper, he demonstrated proficiency in hand-to-hand fighting. Alongside Trooper Vesden, he participated in the Battle of Endor. During the Battle of Endor, the Endor strike team, under the command of Han Solo, infiltrated the shield generator bunker. This resulted in the brief capture of Major Hewex and his unit, which included both Fenson and Vesden. Ultimately, reinforcements showed up and Hewex's team was freed. Near the conclusion of the forest engagement, Fenson was captured by the Rebellion forces before the bunker's destruction.
Star Wars: Episode VI Return of the Jedi marked Fenson's initial appearance as an Imperial navy trooper, though he was not identified by name. Peter Allen, a British actor, played the role, but did not receive credit.