The leader of a group of activists opposed to polaric ion power on a Delta Quadrant world, who takes Janeway and Paris hostage a day before the planet is devastated.
Pe'Nar Makull heads a band of protesters who campaign against their world's reliance on dangerous polaric ion energy. He appears in the first-season Voyager episode Time and Again.
When Kathryn Janeway and Tom Paris are thrown a day into the past of a planet that is about to be destroyed, Makull's group takes them for government spies and seizes them, together with a local boy named Latika. Makull is planning to break into a power plant, and Janeway at first fears that his sabotage is what causes the catastrophe.
During the raid Janeway realises that the explosion is in fact triggered by Voyager's own rescue attempt cutting through subspace. She seals the fracture, the timeline resets and Makull's world is never destroyed.