S1·E5 The Coming of Rei the Handsome Shapechanger!
Aired October 28, 1981
Synopsis
This show features the first appearance of Rei, Lum's former fiance. This episode opens with Ataru in his room watching a storm, and Lum trying to coax him to bed. Shinobu meets Rei and brings him to Ataru's house. After a lot of arguing, Rei challenges Ataru to a duel for Lum.