This is the general discussion post for the episode 4.12 - Warlord. Spoilers for the whole series are allowed
Avon calls a meeting on Xenon between the five most powerful factions resisting the Federation. One of the members, Zukan, the leader of planet Betafarl, is really under Servalan's influence and has secretly planted bombs to destroy the base and likewise unleash a radioactive virus that can kill any survivors. Once Zukan departs, the bombs go off, but unbeknown to him his daughter Zeeona - who is Tarrant's lover - had stayed behind on the base. Zukan himself is then double-crossed by Servalan who had planted a bomb on his ship and sent it spinning out of control. On Scorpio, Avon and Soolin rush back to Xenon to save the others but time is running out. Their only hope may be helping Zukan first, who is the only one who knows how to stop the virus. This episode features the last appearance of Servalan.