The Doctor and Turlough's complicated dynamic, characterized by Turlough's hidden Trion heritage, suppressed anxieties, and the Doctor's growing suspicions about his companion's motives.

The Doctor examines an ancient artifact bearing the Misos Triangle emblem and notices it fits a mark on a column. Turlough identifies the symbol as belonging to his homeworld, Trion, …

Turlough’s carefully constructed detachment slips when local unbeliever Amyand presses him on his origins, exposing a line of inquiry that uncomfortably mirrors the Chosen One prophecies sweeping Sarn. Sorasta and …