Ep. 21: Ataru splits into moral and lecherous halves while trapped in a nightmare sequence
Aired on March 24, 1982

In the first segment, consuming a lollipop from Lum and a bun Cherry planned to bury causes Ataru to divide into two distinct entities: one embodying his chivalrous and moral nature, and the other representing his impulsivity and lechery. In the second segment, Ataru falls asleep in class after repeatedly losing gambling matches to Lum the previous night. He finds himself trapped within a series of nightmares that persist until the dream lord Mujaki and his nightmare-devouring baku accomplice intervene to resolve the situation and free him from the dream state.
Episodes
- Ep. 17 · Shutaro's antique camera transports Ataru to another dimension while he makes an accidental pact with a devil.
- Ep. 18 · Lums' friend Ran arrives to steal Ataru's youth and invite him
- Ep. 19 · Lum uses time travel to read Ataru's diary while Mendou cares for an alien infant.
- Ep. 20 · Shunmin targets Ataru's class while the group enjoys a peach blossom picnic
- Ep. 21 · Ataru splits into moral and lecherous halves while trapped in a nightmare sequence
- Ep. 22 · Lum returns home unaware of her father's matchmaking party, prompting Ten to alert Ataru.
- Ep. 23 · Ataru visits an underwater kingdom while the group gets lost in a dark cave
- Ep. 24 · Ataru and Ten swap bodies after purchasing earmuffs from an alien vendor
- Ep. 25 · Ataru protects a donated caterpillar from classmates after it consumes their lunches