ABC

Fans saw last week that the pages from the Underworld storybook the flame-haired villain was so desperate to get his hands on revealed a shared history between the pair. This week, flashbacks will detail Hades' trip to Oz after learning about Zelena's very special spell, intent on forming an alliance with the witch. However, he'll find himself with more than just a partner in crime.

It's becoming increasingly obvious that there's little out of the real of possibility when it comes to Hades' powers. He's able to travel within worlds with relative ease and seems to know all—and Germann is relishing every minute of it. "It's just so much fun to play," he gushed. "As Hades, what can't I do? I kind of can do whatever I want to do and it's a kind of power there. For the time being, at least, I've got everyone under my thumb."

With all this power, do our heroes stand any chance of victory? If they do, Germann isn't telling. "For now, at least, you can see [the heroes saying,] ‘What can I do?' Well, there's nothing they can do. I'm a god. Go ahead, give me your best shot," he declared. "So, for now, they can't. But what [showrunners] Adam [Horowitz] and Eddy [Kitsis] are doing with all these characters is they're showing, whether it's with Rumple or, I don't know, any of the characters, there's a weakness everywhere. Superman has Kryptonite. So Hades must have something, but you'll have to watch to find out."