Megatron challenges Optimus Prime to a one-on-one duel, which Optimus accepts. Neither side is allowed help, and the loser will take his force and leave the planet in exile.

Optimus Prime has since taken Megatron’s arm as his own after tearing his own arm off in a battle with the Decepticon Skywarp, so fans have to assume that Megatron will want his arm back.