The brutal ideological and operational conflict between the Cybermen and the Cryons, representing absolute technological conformity versus desperate biological survival.

The Cyber Leader and guards lead Peri, the Doctor, Lytton, and Griffiths into the forbidding Cyber Tombs. They pass through enormous wrought iron gates that materialize unexpectedly in the corridor. …

Rost calls out the Doctor's indifference to Lytton's capture after the Cybermen ambush, now fully revealed as an ally of the Cryons. Her challenge exposes the gap between his tactical …