Mercer was the only Cobra Viper that ever defected to the G.I. Joe team and survived. He had joined Cobra for the adventure and the promise of material gain but soon grew disaffected with the Cobra philosophy. He escaped Cobra Island by hot-wiring a hydrofoil and outrunning his pursuers across the Gulf of Mexico. While some team members are still wary around him, even after voluntarily wearing an electronic monitoring armband, he has proven himself to Sgt. Slaughter on countless occasions -- which is no easy task. Although his knowledge of the inner workings of Cobra is valuable, his infiltration skills are his greatest asset. Once he even joined the mainstream G.I. Joe team as an official member by changing his name and appearance, but he soon grew tired of "playing by the rules" and returned to the life on the edge that being a Renegade guarantees.

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