Eric Klieg and the Brotherhood of Logicians seeking to revive and control the Cybermen to enforce their vision of a logical world, versus the Doctor's attempts to stop them.

The expedition’s fragile unity collapses when Hopper reveals the rocket’s sabotage, trapping the crew on Telos. Parry’s attempt to abandon the mission is met with cold refusal, exposing Klieg’s hidden …

In the cavern, Viner panics as the defrosting Cybermen begin to stir, frantically attempting to shut down the process. Klieg, now fully unhinged by his obsession with witnessing the Cybermen’s …