Board Thread:General Discussion/@comment-27744127-20160406031715/@comment-24674051-20160407165016

I think when Hades first showed up, he was interested in Zelena's handiwork (and not just the souls that she was sending his way, though he did mention an appreciation for that as well). He was, I imagine, looking to see how Zelena did the time spell, and then was going to use it for his own purposes (which, btw, would probably radically change the spell that Zelena cast, as I would assume the Butterfly Effect to be in full force, and Hades changes are much earlier in the timeline than Zelena's).

By the end of the episode, I'm not even sure Hades wanted the time travel spell, and I imagine he probably did not even want Zelena to use it. He has found what he believes to be Twu Luv, and is smart enough to know that any tampering with time would affect that.

So why would Hades initially help Zelena? Just so that he could see if, and how, the spell works.