Epic 17: A New Enemy! The Yuumajuu

'''A New Enemy! The Spectral Demon Beasts''' is the seventeenth episode of Tensou Sentai Goseiger.

Plot
Two days after Warstar has been finally defeated, the Gosei Angels follow Alata when he senses an evil presence. This leads them back to the area where he recently defeated Dereputa and they find footprints and an a hole. They are then contacted by Datas of weird occurrences in the city; several people have been dissolved into piles of sludge by a strange slime. Among the victims is the Prime Minister. As the Landick siblings follow the tunnel, Hyde analyzes the slime for Datas while the Skick Angels watch the news of mysterious deaths and realize a pattern. Once contacted by the Landick siblings and Hyde confirming the sludge remains would harm the planet, the Gosei Angels set up a trap to confront the monster responsible: Tomarezu of the Tsuchinoko who is a member of the Earth Condemnation Group Yuumajuu. The group's leaders, Makuin of the Blob and Kinggon of the Bigfoot, appear and explain that they were sealed away ten millenia ago before being released back into the world to once more turn it into a poisoned world. While Gosei Blue battles Tomarezu, the Landick siblings fight Kinggon and the Skick Gosei Angels deal with Makuin, but none of them are able to hurt their opponents as the powers of the Yuumajuu have been enhanced by today's pollution. Tomarezu manages to spray the Goseigers with his slime as Datas comes to their aid. Overpowered by the Yuumajuu, it seems hopeless for the Goseigers when a new figure joins the fight: Gosei Knight. While Gosei Knight destroys Tomarezu, restoring his victims to normal, the reinvigorated Goseigers battle Makuin and Kinggon before the two Yuumajuu escape. After Tomarezu revives as giant vehicle, Gosei Knight turns himself into the Groundion Headder as he becomes Groundion and destroys the Yuumajuu. After assuming his usual form, Gosei Knight leaves the Gosei Angels without a word to their shock. In their base, Makuin and Kinggon wonder why Tomarezu was able to enlarge until they are joined by the one responsible: their old ally Buredoran.