Hades is a villain from the Kingdom Hearts series, originally from the 1997 Disney animated feature Hercules. Hot-headed literally and emotionally, he will stop at nothing to see the end of Hercules.When Maleficent began her conquest of the worlds, Hades became one of her allies. He utilized the Heartless by supplying them as monsters to the Olympus Coliseum, for heroes to battle as usual. However, he also gained the assistance of Cloud Strife by making a deal: if Cloud kills Hercules, Hades will lead him to Sephiroth (who he apparently does know the location of, as Sephiroth is indeed at the Coliseum). Hades additionally provided Sora with a pass to enter the Coliseum games. When Sora appeared to be winning in the Coliseum however, Hades instructed Cloud to kill Sora as well. When the plan failed (either with Cloud refusing to deal the final blow to Sora, or with Sora defeating Cloud; it depends on the result of the battle), Hades had Cerberus attack Cloud. However, Hercules rescued Cloud and Sora defeated Cerberus.

As Sora left the Coliseum, Maleficent warned Hades not to be overcome by the darkness. Hades sent Maleficent away, claiming he could handle it. He ironically was not overcome at all (while the rest of Maleficent's followers and Maleficent herself ended up being overcome, with the other exception of Captain Hook). Strangely, Maleficent overlooked the fact that Hades was the immortal god of the dark underworld. This lead to the inevitable irony of Hades outliving Maleficent as well as being currently the only villain in the whole series to show up in all the games and survive and will probably continue to survive due to him being a god.

When Hades learned of Maleficent's demise, he took matters into his own hands. Hades, determined on personally defeating both Hercules and Sora, opened the Hades Cup in the Coliseum. The long, grueling tournament had a battle with him near the end. Unfortunately for Hades, Sora defeated him in the battle, knocking him into a cell where he was beaten up by someone. After a few more battles in the cup, though, Hades decided on a way for revenge.

In events very much like those in Hercules, Hades unleashed the four Titans upon the world (although only two are seen, it can be guessed that the other two and possibly the Cyclops were as well). When Sora reached the final rank in the tournament, he had to combat the Rock Titan. Upon its defeat, Hades apparently went into hiding.

"Did you forget who you're talking to? I am the Lord of the Dead!"
—Hades