Farscape/Recap/S04 E02 What Was Lost Sacrifice

Season 4, Episode 2:

What Was Lost, part 1: Sacrifice
Elac brings Crichton, Chiana, Rygel and Sikozu to the planet Arnesk, where D'Argo and Noranti are helping Jool and her people to excavate the home of a long-lost civilisation of galactic peacemakers. The planet's magnetic fields are weakening to dangerous levels, giving the archaeological team a limited amount of time to excavate, and worse, the Peacekeepers are on their way, led by Commandant Grayza, her new second-in-command Braca and their tortured captive pet, Scorpius.