Nagaashigon (長足ゴン Long Legged + Gon) is a Kaijuu who has been harmlessly running around the world since ancient times. However, Kinnikuman has to stop him before he runs into a dam, causing massive damage. Knocked down by Kinnikuman, he is unable to stand back up because his arms are too small and he dies after three days. This tragic event causes Kinnikuman to appreciate jogging more.