Tenchi Muyo! Ryo-Ohki

We Need Tenchi! (1x6)

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The girls head for Kagato's ship to avenge Tenchi. Meanwhile, on Earth, Sasami senses Tenchi is in trouble and summons Tsunami, her own Juraian battleship, to save him from near-death. Mihoshi accidentally releases a 20,000-year-old scientific genius, Washu, from Kagato's imprisonment, who turns out to be Ryoko's true creator, and Tenchi returns to face Kagato in a battle to the death.