Casey Jones is a crazed hockey-masked self-titled vigilante who fights crime all crime, from armed robbery to littering. He is a hot-headed avenger who punishes every crime with all his might.

Jones was first introduced to the Turtles in an altercation with Raphael. The two of them actually fought each other in a New York City park, just after Raphael stopped some punks from stealing a woman's purse and Casey was about to beat them to a pulp for that whereupon Casey turns his aggression on Raphael. That initial altercation ended with Jones putting Raphael in a garbage can.

Casey later helped the Turtles while they were being attacked by the Foot Clan above April O'Neil's store.