TK-5331 served on Lothal. Ranking as a Stormtrooper, he served under Lieutenant Jenkes and was responsible for the operations of Squad Five. When the Trandoshan Bounty Hunter Bossk arrived on Lothal to collect the bounty on Gronson Takkaro at Ake's Tavern, Jenkes ordered TK-5331 to dispatch Squad Five to keep an eye on the bounty hunter. Jenkes, who had secretly hired bounty hunters to kill Bossk, ordered TK-5331 to use remotes to record the encounter. After Bossk defeated the bounty hunters and evaded Imperial capture with the help of Ezra Bridger, Jenkes commanded TK-5331 to exterminate the pair for crimes against the Galactic Empire.