Barclay's internal moral struggle between his duty to Cutler and his conscience regarding the catastrophic potential of the Zee-bomb.

In the Tracking Room, General Cutler’s paternal concern for his son Terry—currently orbiting in peril—clashes with his military pragmatism as he assesses Earth’s three existential threats: the Cyberman invasion, Mondas’ …

With General Cutler distracted by the Cybermen’s approach and the ticking countdown to the Zee-bomb launch, Polly seizes the moment to manipulate Doctor Barclay into aiding her sabotage mission. She …