Rinzler is Clu's primary enforcer. He is an exceptionally skilled warrior and is the elite combatant in all games in the Grid. In addition, he is the only known program to use two identity discs in battle. Originally known as Tron, Rinzler's identity came into being when Tron was "repurposed" by Clu.
In TRON: Uprising, Tron was forced to adopt the name and appearance of Rinzler after his battle with Clu, using the disguise to avoid capture as most programs believed that he was dead.