The Doctor versus The Monk's personal vendetta, resulting in sabotage and pursuit.

The Doctor, Sara, and Steven are stranded on the volcanic planet Tigus, where the Doctor insists on confronting their unseen pursuer rather than fleeing. While the Doctor muses aloud about …

The Doctor, having just outmaneuvered the Monk’s sabotage of the TARDIS lock using his ring and Tigus’ sunlight, successfully unlocks the ship and departs. The Monk, watching from a distance, …