Jet was the teenage leader of a group of refugee Earth Kingdom children who called themselves the Freedom Fighters.

When Jet was only eight years old, he witnessed his parents' deaths at the hands of the Fire Nation soldiers known as the Rough Rhinos. Jet grew up to become a hook sword-wielding vigilante, possessing a burning hatred for the Fire Nation and going to extreme lengths to exact his revenge, even to the point of endangering innocent lives in a raid of a small Fire Nation-occupied Earth Kingdom town.

Jet disbanded the Freedom Fighters after an encounter with Team Avatar and, together with Longshot and Smellerbee, decided to start a new life in Ba Sing Se. When he tried to expose Prince Zuko and Iroh as firebenders, the Dai Li arrested and brainwashed him into submission.

A second encounter with the Avatar and his friends revealed the truth of the Dai Li to Jet, and he helped them find Appa by leading them to Lake Laogai, the Dai Li headquarters. There, Jet was fatally wounded by Long Feng when he overcame the hypnosis placed upon him.