Base figure- Superhero Show Down Colossus with Star Wars Dark Trooper parts bashed onto him. (The helmet is missing in these pictures.)
Robo-Joe: The muscle of the team. When his body was damaged beyond hope, Mainframe and Dodger created a new armor to help keep him alive (think Iron-Man).
Constant upkeep is needed to keep the armor functioning properly.
Here is the back story . . .
The events described in End of Days take place after Dead End*.
The zombie outbreak had all but doomed humanity. Government Scientists, in secret locations, work at fever pitches to reverse the effects and find a cure. Meanwhile the united leaders of the world agreed to level major Cities (which had been abandoned), using non-nuclear weapons, hoping this would get the virus under control. But it did not. The result was destruction and major power outages.
The battle between the G.I. Joe team and Cobra continues.
(*Dead End was a Dio-Story I had posted in 2003. It was taken off the internet in 2008. The story of Dead End described how Cobra created a virus based bio-weapon that could reanimate the bodies of the recently deceased. The weapon, The Dead End virus, was going to be sold by M.A.R.S. industries. During a demonstration, things went wrong and the infected corpses escaped. The virus spread worldwide in a matter of weeks.)