A watery planet? Yes. A planet with near-human looking aliens with hair on top of their head? Almost 0. The upright posture with opposable thumb design is clearly not very common, as evidenced by the fact that the hominid species came into existence for only about a million years in a timeline that spans 530 million years for vertebrates to come into existence. (or 1 million since the 100+ million years that mammals existed) Seems a huge fluke that a primate-like species with 3 cones for finding fruit that eventually becomes upright on the plains will ever popup in the universe.