第 33 集: 少年回到肌肉星球，接受嚴苛的究極肌肉能力考驗。
2002年8月21日 播出
33
After defeating Eskara The Kid is summoned back to Muscle Planet to test his Ultimate Muscle power! He is weak and is bruised from his battles and so is given the chance to fight the Gruesome Threesome (a group of wrestlers who got their name from what their victims looked like) to find alternative ways to win other than getting beaten up. If Kid defeats the Gruesome Threesome, Kid would have to learn the true power of his Ultimate Muscle power. His father and the council believe this will toughen him up and give Kid a reputation that will make every villain fear Kid. But his Muscular foes won't be easy to overcome. If Kid loses the Gruesome Threesome will receive a full pardon. (Source: Wikipedia)
集數
- 第 29 集 · 小肌肉誤解羅克珊的感情，並訓練以擊敗埃斯卡拉
- 第 30 集 · Eskara 脫離 Kinnikubuster 並揭露其真實身份為 Mars
- 第 31 集 · 少年在失去頭骨與金剛破壞拳的情況下陷入絕境
- 第 32 集 · 少年以智謀與肌肉千年擊敗火星，奪得地球冠軍
- 第 33 集 · 少年回到肌肉星球，接受嚴苛的究極肌肉能力考驗。
- 第 34 集 · 少年直面 Forkollossus，Checkmate 強勢回歸，本集為第二部曲。
- 第 35 集 · 少年正面對決令人聞風喪膽的半藏，忍者奈德則介入兩人的戰鬥。
- 第 36 集 · 忍者內德犧牲後，少年必須直面半藏
- 第 37 集 · 少年在沒有必殺技的情況下戰鬥，而半藏的榻榻米人偶突破了草蓆防線。