Love Battle Royale / Father, You Were Strong
14-1. Mendo Arrives With Trouble! Mendo returns for a formal introduction on his first day at school. He and Ataru have a duel for presidency of the class which ends in a tie. So they have a duel with cannons, which Ataru wins with help from Lum. 14-2. Constellation-Go-Round Lum's computer tells her that Mendo is really the best choice for her lover, so she brings a set of constellation scales to school and weight Ataru versus Mendo in a series of test in the scales. At the end, the scales break and we see the class as constellations.
Aired 13/01/1982EP 12 - Love Battle Royale / Father, You Were Strong
Urusei Yatsura
It all begins when aliens invade and threaten to conquer the Earth! However, one member of the human race is chosen at random to duel the aliens and save the planet: Ataru Moroboshi, a lecherous slacker from Tomobiki High School who begrudgingly participates. All he has to do? Play a game of tag and catch Lum — the beautiful alien princess in a tiger-stripe bikini — by the horns. Unfortunately for Ataru, it’s not so simple, since Lum can fly and deliver electric shocks! Perseverance pays off, but once he catches her, Ataru experiences another shock: He’s now Lum’s betrothed “darling” and she isn’t going back to her home planet anytime soon!
(Source: Crunchyroll)