Urusei Yatsura (1981) Season 1 Episode 23

First appearance of Tsubame, Sakura’s boy friend who has some magic abilities. Sakura invites Ataru, Lum, Shinobu, Megane, Perm, Chibi, and Kakugari to a disco. Things later go haywire as Tsubame starts casting spells and all sorts of weird creatures appear, including Rei.