Hannah Mercer's struggle to maintain authority and morale against systemic decay and external threats

Mercer probes Styles about ignoring station decay, positioning his own concern for morale as a contrast to the medical officer’s narrow focus. Styles deflects with personal stakes—his pending promotion and …

With the Dalek battle cruiser bearing down and the station’s systems failing, Mercer assumes leadership after realizing the captain and half the crew are dead. Styles’ scorn for futile resistance …

Osborn succeeds in accessing the control box and arming explosives near Dalyk gas canisters. Mercer, infected by the gas, begs for help but convulses as his body dissolves. In a …