Theta Squad was an Imperial squad of infantry that found itself positioned on Endor, a moon covered in forest, not long before the Battle of Endor occurred. Rell, a scout trooper, was a member of this unit. The entire squad met their death when they stumbled upon a rebel strike team. After Theta Squad didn't check in, they were listed as missing in action. The stormtroopers of Gamma Squad were then dispatched to locate them, which led to their discovery of Luke Skywalker, who in turn showed them the deceased members of Theta Squad.