In the original 90s anime, Episode 4 is titled (English dub: " Slim City " ). It primarily focuses on Usagi’s struggle with body image and a deceptive plot by the Dark Kingdom. Episode 4 Summary (90s Anime)
Luna grows suspicious and follows Usagi to the gym. After realizing the trap, Usagi transforms into Sailor Moon to stop Jadeite’s plan. Interestingly, this is one of the few episodes where Jadeite’s scheme doesn't involve a monster (Youma). Sailor Moon Episode 4
If you are watching the more recent reboot, Sailor Moon Crystal , Act 4 is titled . In the original 90s anime, Episode 4 is
After being teased by her family and friends for gaining a little weight, Usagi becomes obsessed with getting thin. In the original 90s anime