Two archaeologists, Korving and Joy, study glyphs which reveal that the Cybermen and Golgoth destroyed each other two thousand years earlier. Mondas' orbit is decaying once again, and Korving believes that Golgoth's son is their last hope for survival. He threatens the Lord High Priest of C'iva, the leader of the Cult of C'iva, whom he believes has the answers he seeks. However, just then, Mondas breaks free of its orbit, and in the cataclysm Joy and the priest are killed. Dying, Korving unknowingly crawls into an old conversion unit, becoming the first of the new Cybermen.
- The earliest Cybermen, now extinct, are now known as the Knights of C'iva.
- The Cult of C'iva dwells in the remnants of Cyber control and awaits the return of Golgoth's son.
- This story reveals that Mondas' orbit decayed twice.
- Golgoth's son, which appeared in The Future Perfect as a still a developing embryo, makes an appearance.
This story takes place sometime before the events of the Tenth Planet.