Jace, testing his new Time Regressor, accidentally sends Jan back to Viking Days, where she becomes the slave of Tarko the Terrible! He travels back to rescue her but soon finds himself in trouble, overpowered by Tarko's men. Luckily, Space Ghost realizes where the pair has gone and follows them. He overpowers Tarko, earning the Viking's respect and an invitation to his lodge as guests. But they must return - Space Ghost remembered what Jace didn't - to see the automatic recall computer.