Tenchi Muyo! Ryo-Ohki Episódio 18 Online

Lady Tokimi's progeny Z finally moves against Tenchi, and an epic battle in space ensues. However, when the other two chōshin, Tsunami and Washu, discover Z's motivation for wanting to kill Tenchi, they are forced to move against their sister, bringing about a confrontation that threatens to destroy Tenchi, Z and the universe itself.