Ryunosuke Confused! Solid Rock Mother Cherishes Her Young Pebble!
While swimming on the ocean floor, Ataru and Mendou find a woman on the search for her missing child; a woman who just may be Ryuunosuke's long-lost mother. Source: crunchyroll
Aired 22/08/1984EP 123 - Ryunosuke Confused! Solid Rock Mother Cherishes Her Young Pebble!

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)