Tegan and Nyssa's dual struggle to locate the Doctor while evading Castrovalva's hunters and understanding the town's deceptive nature

Tegan and Nyssa piece together the Doctor’s fractured regeneration by examining traces of his encounter with the broken cabinet’s Zero effect. Their deduction leads them to realize he was briefly …

Tegan and Nyssa trace the Doctor's bloodied trail through the woods to the cliffs only to find the scarlet markers growing more frequent. Their search halts when a silent ring …

Shardovan stands in the library doorway as Tegan and Nyssa emerge laden with recovered texts. Their conversation reveals the limited usefulness of the books for escaping Castrovalva’s traps while confirming …