Sanzu River
was one of the Gaiark ministers who fought the Go-ongers. Acting on his own to avenge his vice minister Hiramechimedes, Yogostein met his end at the hands of Go-on Red. In "", Yogostein, along with Kegalesia and Kitaneidas as the ghosts, were dragged from the bottom of the Sanzu River by Batcheed to cooperate with his plan but he declines. Yogostein makes his return in "Gokaiger vs. Gavan" where he, along with his fellow ministers, is detained in Makuu Prison before he is freed by the Gokaigers.