To unlock Hades, you'll need to have received the second seal, the Cerberus seal, from Zeus and Hera. From there, head to the ...

Here are the Pandora’s Box murals that will be seen in the game, which include Zeus, Ares, Cerberus and Hades, with the theory being that Hades may be the main villain of this season.

Percy Jackson and the Olympians episode 7, "We Find Out the Truth, Sort Of," lets us and Percy in on what's really been going on when it comes to the Master Bolt.