The Doctor and Romana’s tactical improvisation to harness the unstable Key to Time’s power as a weapon against the Shadow, balancing improvisation against escalating temporal collapse.

The Doctor returns with a Chronodyne component improvised under extreme pressure, its compatibility rated at only seventy-four percent by K9. Romana slots the unstable piece into the clear Key to …

The Doctor and Romana celebrate their near-victory over Mentalis, the looped time now confined to the Marshal’s vessel and the Zeon computer room. But K9 quickly reveals the chronodyne chip’s …