Ужасный космический пират Кэйн [Kain] сбегает из тюрьмы и разрушает штаб-квартиру Галактической Полиции. Для того, чтобы Дзюраи [Aeka Jurai Masaki] не смогла ему помешать, Кэйн возвращается в 1970 год, чтобы убить мать Тенти [Tenchi Masaki] еще до его рождения. Тенти со своей компанией должны отправиться в прошлое, чтобы помешать Кэйну, пока Тенти не перестал существовать.

In a dark corner of the universe, intergalactic criminal Kain breaks out of prison and destroys the Galaxy Police Headquarters. Basking in the afterglow of the terror and destruction he has caused, Kain sets his sights toward a much bigger prize waiting on Earth.

Meanwhile, Tenchi Masaki and his crew are watching some old home videos of his mother, Achika. As the film rolls, Achika slowly starts to vanish. While watching her fade away, Tenchi also begins to disappear. However, thanks to a device created by Washuu Hakubi, Tenchi is not gone for good.

The gang soon learns about Kain and deduce that he must have done something to Achika, which has resulted in time being altered. To save himself and maintain the future, Tenchi travels with the girls back in time to protect his mother from her fate.

[Written by MAL Rewrite]