The escalating alien invasion by the Wirrn, including larval breaches, possession of crew members, and systematic infiltration of the Command spaceship

Noah fights against the alien parasite consuming his body, striking his own grotesque pseudopod against the control console in a desperate attempt to expel the invader. The violent act damages …

With the Wirrn larva forcing an attack in the tranquilliser room, the Doctor deduces humanity’s only hope lies in electrified weapons but cannot reach the control centre directly. Seizing on …

With the Ark’s infrastructure collapsing and the Wirrn larvae threatening to breach the tranquiller room, the Doctor connects the Wirrn’s desire to destroy humanity with their known weakness to electricity. …