Character » Mercer appears in 18 issues.
Cobra is the nemesis of the G.I. Joe team. Along with battling G.I. Joe, the members of Cobra are dealing with numerous internal power struggles.
G.I. Joe is America's elite fighting force. They are the best trained counter-terrorist team. The only defense against the villainous terrorist organization, Cobra.
A Viper is the code-name given to specialized group of soldiers/troops in the Cobra.
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