opens the hatch and the team descend, leaving Kaftan and Victoria behind. They find a vast chamber beneath with a multistorey structure, containing a small army of frozen Cybermen. Back in the control room, Kaftan drugs Victoria and reseals the hatch. Klieg revives the Cybermen betraying the group, killing Viner when he tries to stop the process. As the Cybermen emerge, Klieg reveals that he and Kaftan belong to the Brotherhood of Logicians, a cult with great intelligence but no physical power. He believes the Cybermen will be grateful for their revival and will ally themselves with the Brotherhood to conquer the universe. After they awaken, the Cybermen revive their leader, the Cyber-Controller, and take the group as prisoners. The Doctor realizes that the tombs are actually an elaborate trap, with the Cybermen keeping themselves frozen until they were revived and rebuild their invasion force to conquer Earth. When Victoria awakens, she confronts Kaftan, who holds her at gunpoint to prevent her from interfering. However, she is attacked and rendered unconscious by a Cybermat, which Victoria destroys. Retrieving Hopper and co-pilot Callum, who have stayed to repair the rocket, they open the hatch to mount a rescue, using smoke grenades to distract the Cybermen. Though they are able to rescue most of the party, Toberman is recaptured and taken to be converted. Disarming and placing Klieg and Kaftan in the weapon testing room while they wait for the rocket to be repaired, the group is attacked by a swarm of Cybermats, which the Doctor incapacitates with electrical currents. After repairing a cybergun on the dummy, the Logicians return and open the hatch, believing that they can still forge their alliance with the Cybermen. With their energy levels running low, the Cybermen return to their tombs whilst the Cyber-Controller and a partially converted Toberman meet with the group. Taking him to the revitalizing chamber, the Doctor attempts to sabotage the process. Controller escapes and turns on the group. After it murders Kaftan, Toberman breaks free of the Cybermen's conditioning and disables it. While he, the Doctor, and Jamie return to refreeze the tombs, Klieg, unable to accept that the Cybermen will not forge an alliance, tries to stop them, only to be murdered by a Cyberman. After Toberman destroys it, the Doctor activates the tombs, hoping that the Cybermen will stay there for good. The Doctor reseals the tombs and sets