A member of COBRA expert of sabotage, arson and, explosives, In the Sigma Six series he was a member of G.I. JOE, but eventually betrayed the team and joined COBRA. Has most recently been seen as a psychotic pyromaniac in the series G.I. Joe Renegades.
Firefly was an expert in sabotage, demolition and explosives
Firefly was a member of G.I. Joe in season 2 of the series, he turns against the team halfway through season 2 and joins with Cobra Commander, he shaves his head as a sign of loyalty (really showing that COBRA has a sort of Nazi vibe to it) Duke tries to redeem Firefly and seems to succeed, only to be stabbed in the back again.
G.I, Joe Resolute:
Firefly only appears in the first episode, not that he dies in the series or anything like other 1-shot cameo characters, he simply fires a rocket with a holographic message from Cobra Commander into the United Nation's building and is never seen again.
G.I, Joe Renegades:
Firefly appears in one episode thus far, he was a pyromaniac arsonist hired by COBRA Industries to burn down an entire small town, the Joes and Berbeque were able to stop him, he escaped, and has not since been seen (that may do it for this incarnation, this series is rumored to be cancelled)
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G.I. JOE: The Movie
1987 animated G.I. JOE movie