Humiliated by his defeat in Mega Man 5, Star Man is furious that his second chance to prove himself was ruined by Mega Man V for Gameboy using original bosses, so after years of training he sets out to defeat the Stardroids and prove that he is the greatest space robot ever created. Despite his training efforts, all Star Man has really learned is how to walk; other than that he functions exactly as he does in Mega Man 5. In order to attack you must create a shield while on the ground and then fire it while in the air. With practice this can be a surprisingly effective attack method, while also working good for defense.
