Ep. 33: The Kid returns to Muscle Planet for a grueling test of his Ultimate Muscle abilities.
Aired on August 21, 2002

33
Bruised from recent battles, the Kid is summoned back to Muscle Planet to prove his Ultimate Muscle power. To avoid further physical damage, he faces the Gruesome Threesome, a wrestling group named for the appearance of their victims. This match offers an alternative to traditional brawling, aiming to teach the Kid new ways to win. His father and the council believe mastering this true power will toughen him and establish a reputation that instills fear in villains. However, the muscular opponents present a significant challenge. If the Kid defeats them, he must unlock the full potential of his abilities. Conversely, a loss results in a full pardon for the Gruesome Threesome, raising the stakes of this critical test.
Episodes
- Ep. 29 · Kid Muscle Misunderstands Roxanne's Feelings and Trains to Defeat Eskara
- Ep. 30 · Eskara escapes the Kinnikubuster and reveals his true identity as Mars
- Ep. 31 · The Kid faces a desperate situation while lacking his skull and Kinniku-buster.
- Ep. 32 · The Kid defeats Mars using his brain and the Muscle Millennium to win the Earth championship
- Ep. 33 · The Kid returns to Muscle Planet for a grueling test of his Ultimate Muscle abilities.
- Ep. 34 · The Kid faces Forkollossus and the return of Checkmate in this second part.
- Ep. 35 · The Kid confronts Hanzo the Horrible while Ninja Ned intervenes in their battle.
- Ep. 36 · The Kid Must Face Hanzo After Ninja Ned's Sacrifice
- Ep. 37 · The Kid fights without his finisher as Hanzo's Tatami puppet overcomes the grass mat defenses.