The SDF-1, transformed back into ship mode once more, arrives at a human outpost on Mars to gather fresh supplies, but discover that the base was damaged in a battle years before and had no survivors. However, the Zentraedi lie in wait with a new commander, Khyron, raring for glory by using gravity mines to trap the ship. In the midst of the fight, SDF-1 First Officer Lisa Hayes tries to find out whether her old fiance, Carl Riber, is still alive.