Blake's 7 (1978)

S4E12 Warlord

Avon sets out to forge a coalition aimed at creating an anti-pacification drug, engaging with the leaders from three rival star systems. Meanwhile, the Xenon base faces destruction through sabotage involving explosives and a lethal virus. In the midst of this turmoil, Tarrant finds himself romantically drawn to the daughter of the individual responsible for the sabotage.