Urusei Yatsura Movie 5: The Final Chapter

Synopsis:

Long ago, before Lum and Ataru met (before they were born, even), Lum’s grandfather made an agreement. After being tricked by a merchant into eating a poisoned mushroom, he traded his granddaughter-to-be’s hand in marriage for an antidote. Now, 120 years later, Lum has grown to a marriageable age, and the merchant has come to collect his due! When Lum is kidnapped, Ataru must go on a planetary chase to get her back, initiating a sequence of events that will end the adventures of the Tomobiki gang once and for all…