In the sixth and final movie installment from Rumiko Takahashi, Lupica, yet another whacked out alien space princess, finds her way to Earth. She needs the possessor of the greatest lust in the universe in order to concoct a love potion that will entice her true sweetheart to propose to her. That most lustful creature happens to be Ataru, and you can bet Lum won't take his abduction by Lupica lying down...

What would you do if you found a boy in a bunny suit lying in a trashheap? That's what happens to Shinobu on her way back from the market. When he tries to hit on Shinobu, she throttles him and finds a strange key that dropped out of his pocket. But what do you do with a key that has no door? Build one, of course! Unfortunately, Lum decides to take it upon herself to do so - and upon entering, Lum, Shinobu, and Ataru fall literally into their own futures!

In "Raging Sherbet," Lum, Benten and Ran decide to beat the Tokyo heat by taking a summer vacation with Oyuki on Neptune. Then, in "I Howl at the Moon," Ataru learns to think before he eats when he gobbles down some of Lum's Cherry Rice Cakes -- and promptly starts turning into a wolf!

In "Catch the Heart," a mischievous spirit gives Ran a heart-shaped candy that causes a magical heart to appear over the head of whoever eats it. And if there's one thing the Urusei Yatsura crowd can do, it's play catch!

In "Date with a Spirit," things get crazy when Ataru tries to hit on a beautiful ghost who has attached herself to Sakura's sorcerous Fiance, Tsubame. Then, in "The Terror of Girly-Eyes Measles," Ten gives Ataru an alien disease, the contagious "Girl Measles," and when Ataru's girl-hunting spreads the virus all over Tomobiki Town, chaos ensues!

Lum, Ataru, Mendou and Shinobu visit an inn which Ryuunosuke and her father have opened. Then, Mendou hires a new personal Ninja with some very unusual abilities, only to have him fall head-over-heels for his manipulative sister, Ryoko.

Some of the best scenes of the TV series are combined with 15 minutes of new animation to reveal the pasts of Ryoko's guests. Then, the Mendou clan's personal satellite narrates the story of the Mendou family, using a mixture of new animation and scenes from the series.

When the Oni, a mysterious race of Aliens, come to repossess the Earth, they give us one chance to save our planet: a champion, selected at random, must defeat their princess, Lum, in their national sport - Tag! Unfortunately for Earth, the champion turns out to be Ataru Moroboshi, a lecherous lad whole lack of luck is legendary!

Ran makes another attempt to streal Ataru from Lum...

Chaos reigns supreme during the self-study period when Rei drops in for a visit! Then, the return of the mysterious 'Red Cloak' sets up a night of Disco.

Lum and Ataru actually go out on a date; A trip to the seaside results in a run-in with a cursed watermelon; A typhoon treads on Tokyo, panicking Ataru's parents.

In the episode voted 'Best Episode' by Japanese viewers, Lum decides to find out if Ataru is really series about wanting to be rid of her; Benten, Oyuki and the rest of Lum's friends descend upon the High School; and then when the gang starts sneaking from school to get fast-food, the teacher mobilize for all-out war

Tabloid TV reporters go on a rampage when Ataru assembles a bird out of old fossils and Lum brings it to life...Goblins are galvanized into action as they once again try to find a mate for the lovely Princess Kurama!