In the first Urusei Yatsura movie, Ataru found himself a reluctant bridegroom trapped between two Alien Princesses.
In the second Urusei Yatsura Movie, he found himself trapped in a dream of Lum's making. Those were just warmups:
This time he finds himself...Herbivorous??
When Lum was born, a postal screwup caused a witchy friend of the family not to get an invitation to the celebration. Believing herself snubbed, she lays a curse on Lum - that she will never be happy with her True Love.
In the present, a new Amusement Park has been built in Tomobiki, and opening day finds the whole gang sampling its pleasures. At a magic show, however, Ataru gets turned into a pink hippopotamus - FOR REAL!
When Lum attempts to track down the magician that transformed her darling, things start to get very weird, very fast.