Arnold Casey Jones, Jr., better known as Casey Jones is a major protagonist of the Teenage Mutant Ninja Turtles 2003 cartoon series. He is a hockey-masked self-titled vigilante who fights crime at night and is a close friend/ally of the TMNT (though is usually the closest to Raphael) and their adoptive father, Master Splinter. He's also the primary love interest to April O'Neil, who Casey marries in the series finale.
He was voiced by Marc Thompson, who also voiced Duke Devlin, Astral, Ash's Tepig, Gliscor and Sandile.