A short animated fan film (in 3 parts) featuring a fight between The Hulk and One Punch Man. You can watch part 1 and 2 below, with part 3 soon to follow.
When Bruce Banner going abroad, he stumble upon a strong creature in Z city. Inevitably he give in to anger and turn into hulk. Losing control of himself now its up to Saitama, the Bald Cape Hero to tame the green beast.