Kinnikuman II Sei: Muscle Ninjin Soudatsu sen! Choujin Daisensou

キン肉マンII世 マッスル人参争奪! 超人大戦争

In order to save a princess, Mantarou (Kid Muscle) and the gang must find a special ginseng. They are later joined by Kevin Mask. (Source: Wikipedia)