Hades with Poseidon and Zeus were able to kill Kronos. Poseidon was the god of the sea. Zeus was the king of all gods and the lord of the sky. This left Hades as the king of the underworld.

Hades became a god by killing Kronos. His brothers were Poseidon and Zeus. Since Hades is the lord of the underworld, he is always very gloomy. Because of this, when he came back to the over world, he was in a very bad mood