Read G.I. Joe: Frontline Comic Online
The stories explored what happened to G.I. Joe and Cobra concurrently with the main continuity of G.I. Joe: A Real American Hero, with the exception of the first arc. Larry Hama wrote Frontlines initial offering, The Mission That Never Was, a four-part series set one month after the events of the Marvel G.I. Joe: A Real American Hero issue #155.
