Board Thread:Spoilers!/@comment-27060727-20160225003107/@comment-25926288-20160225182329

So, definitely seems to be a Hades centric which works. It seems similar to 3b in a number of ways, so I expect this to be the end of the Underworld and set up for a two-parter episode.

So, Prince Marcus could and is likely Zeus. However, I'll have to wait for more information to be sure of that.