Yu Yu Hakusho Episode 90 English Dubbed Episode Title:Attempting Revenge.Episode Description:Kuwabara, Kurama, and Hiei increase their power and pursue Sensui through the breach, incensed by the death of Yusuke. Kurama transforms into Yoko Kurama, as Hiei releases the dragon of the darkness flame. Since Kurama and Hiei only have demon energy, they are unable to pass the barrier, unlike Sensui, who possesses sacred energy. Kuwabara slices through the barrier between worlds to pursue Sensui into the Demon World. Though they have him outnumbered, they prove to be outmatched against Sensui's attacks.