Billy is a creature who came to Earth from another planet. His ship lost control of the strong earth's gravity and the hero had to catapult. He fell straight into the sea and immediately sensed danger. There is water on his home planet, but he is a land creature himself, although he can perfectly swim under water and breathe. But on an alien planet he is surrounded only by enemies and he wants to escape from here as soon as possible. His mini radar showed where the ship fell, maybe it can be repaired, but first you need to get to it. It turns out that the ship also fell into the water, but several hundred kilometers from the place where our alien is now. Help him get to the place, he will move very quickly, and you move him up or down, depending on the obstacles that appear in the form of predatory fish, jellyfish or sea urchins. Collect coins and other trophies to get the opportunity to improve the hero's abilities in Run Billy Run.