title: Cobra (G.I. Joe)
context: Cobra (sometimes referred to as Cobra Command) is the nemesis of the G.I. Joe Team in the Hasbro action figure toyline G.I. Joe: A Real American Hero and G.I. Joe: Sigma 6, as well as in related media.[1]
question: Who is G.I. Joe's arch-nemesis?
answers: Cobra