The Gruenaks are supporting antagonists of the 2019 Netflix prequel series The Dark Crystal: Age of Resistance. They are a endangered race of sloth-like beings on Planet Thra with a reputation for being mechanically-minded and surprisingly strong. They serve as the main henchmen of the Skeksis (mainly SkekSil).
The Gruenaks were almost completely exterminated by the Skeksis, though two survivors; Jooj Pem and Toot Teller were later captured by Sifan mariners and sold to SkekSil, who handed them to SkekTek so that they could assist him in repairing the draining chair. To ensure their silence, SkekSil had their mouths sewn shut.
Within a few days, the Gruenak Duo had fully mechanized the essence-draining process and assisted the Skeksis in capturing many Gelfling and draining their essence. Later, the Gruenaks secretly struck a bargain with SkekSil, replacing SkekVar's essence vial with diluted Swothel milk in exchange for their freedom. SkekSil however delayed granting them their promised liberty, and they impatiently cut the stitches on their mouths.
Following their attempt to escape, Jooj Pem and Toot Teller were discovered by SkekTek, who was enraged by their defiance and attacked them. He killed both of them by throwing one of them down the Castle shaft and bludgeoning the other to death; thus bringing an end to the whole Gruenak race and making them extinct. Gruenak physiology was later combined to that of the Arathim Silk Spitter to create the first Garthim.
- The Gruenaks were based on the race of "miners" from Jim Henson's 1978 screenplay of The Dark Crystal.