The TARDIS materializes on the USS Eldridge, following the Philadelphia Experiment has gone disastrously wrong. Most of the team are useless, the dispatch is normally disintegrating, and the Doctor soon realizes that the problem comes from another aspect… As they attempt to find a way to have the dispatch home, the Doctor and Peri go to the faraway world Capron and meet its tyrannical ruler Osloo. But the visit a possible solution just creates progressively dire problems. Osloo’s horizons have been widened – and space and period are hers for the acquiring…