When everyone on Earth is brainwashed by the Black Water Mist, Piccolo, Gohan and Krillin battle Garlic Jr. Piccolo is easily winning against the small Demon until he transforms to his giant form. Krillin tries to help Piccolo but is not strong enough. Gohan then battles Garlic Jr and defeats him by destroying the Makyo Star.
Besides from winning with Kid Gohan there are three other endings. Defeating normal Garlic Jr. (although this is hard to do), defeating Super Garlic Jr with Piccolo or Krillin.