In late 99 AG, the captain was patrolling a mining village in the Earth Kingdom with two fellow soldiers. During their walk, they encountered Katara and Sokka, who staged a fight during which Aang would use a mineshaft to mimic the prohibited art of earthbending. Upon seeing a boulder being lifted in the air following Katara's command, the rig captain mistook Momo, who was revealed sitting behind the rock, as the bending culprit, much to his surprise. However, when Sokka corrected his mistake, he took Katara into custody and brought her to the prison rig.