Zeus along with the rest of the Olympian gods perished in the third titanomachy.
In order to keep the balance of the world in check and prevent the titans from awakening once again, Jaimie and Pandora set out to find the new generation of gods to rule the old world.
Pandora hates the idea but she's still forced to walk the earth searching for mere mortals. 
On the other hand, the Professor has plans of his owns and is very intent on redeeming himself in the eyes of his brothers.

Greeks : New Era