After being defeated by the Jurai Emperor and the Galaxy Police centuries ago, the monstrously powerful Super A-1 class criminal Kain was imprisoned in the subspace room of the GP's headquarters, never to be released.

In the present (established to be 1996, the year of the film's release), Kain escapes his bonds, destroys the GP space station, and travels back in time to take his revenge on Jurai's royal family.

The shield is only a temporary solution, so Washu sends the rest of the group back to 1970 to prevent Kain from killing Tenchi's mother Achika.

After determining the exact time that Kain strikes in 1970, the group tries to defend Achika, only to see the villain escape into subspace with her and Nobuyuki.

Tenchi is wounded, and Achika unlocks her latent Jurai powers to fuel his sword and deal a crippling blow to Kain.

The end theme song is Alchemy of Love, written by Franke and performed by Nina Hagen, with Rick Jude on backing vocals.