Kinnikuman II Sei: Muscle Ninjin Soudatsu sen! Choujin Daisensou  

Massuru Ninjin Soudatsu! Choujin Dai Sensou, Muscle Ginseng Competition! The Great Choujin War, Kinnikuman 2 Sei: Muscle Ninjin Soudatsu sen! Choujin Daisensou

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)