The Doctor has been to Det-Sen Monastery before, and expects the welcome of a lifetime. But the monastery is a very different place from when the Doctor last came. Fearing an attack at any moment by the legendary Yeti, the monks are prepared to defend themselves, and see the Doctor as a threat.

The Doctor has been to Det-Sen Monastery before, and expects the welcome of a lifetime. But the monastery is a very different place from when the Doctor last came. Fearing an attack at any moment by the legendary Yeti, the monks are prepared to defend themselves, and see the Doctor as a threat.