Firefly is the tertiary antagonist in G.I. Joe: Retaliation. Here, Firefly serves as a former G.I. JOE member who switched sides over to Cobra. He is portrayed in the film by Ray Stevenson, who is famous for playing Volstagg in the Marvel films Thor and Thor: The Dark World and Frank Castle/Punisher in the reboot film: Punisher: War Zone and Roger Wesley in The Other Guys.