The Warpie known as Hal gained his powers when he was effected by a reality warp created by Mad Jim Jaspers when he attempted to take over Great Britain. Somehow, Peeping Tom was not discovered by the agents of the R.C.X. and needed to be "rescued" from his family.
All of the Parasites were trained by Uncle Lex to use their powers to become petty thieves and to obey him blindly, which the children did without question. Since Uncle Lex didn't value the children under his care, he taught them to not really care about each other as well.
Later, when a jewelry heist went bad, Snap became scared and teleported blindly and was struck by a city bus, killing him. Snap's death upset the Cherubim, especially Fern, who were all still mourning the recent death of Cherub Whirlwind. 
When they returned to the Den, Fern confronted Uncle Lex and the Cherubim decided to leave them and find a new home. However, Uncle Lex had other ideas and wouldn't let them and set the Parasites against the Cherubim. Hal fought and defeated the twins AC-DC, by using his powerful breath to force them away from him.
It is unknown the fate of Hal after that. However, it is certain that he did loose his powers as did most of the other Warpies on Otherworld.