Anticipating nuclear war that would leave Earth barren of life, Lars Kranston convinces his colleagues to go to Mars. His paramour Betty Stone insists that she go as well. The ship crashes on Mars. Everyone but Lars and Betty are killed, but Lars thinks she died too. Betty wakes up suffering total amnesia. Lars decides to use the supplies that survived the wreck. He manages a complete sex change. The tumultuous situation on Earth dies down. The predicted war never occurs. Betty remembers the journey. She finds Lars, who explains his sex change to a woman. Betty breaks down at the revelation.

Plot details indexed by the Grand Comics Database (CC BY-SA).