Imagine Hercules and Achilles locked in combat. The two heroes trading blow for blow in an epic melee. The heroes tossing each other through buildings, chasing each other across the fields of antiquity, and eventually a crushing defeat and valiant victory. This epic combat is something that would be fantastic to behold.
Heroes battling heroes is a setting ripe with content for every form of media. Mighty characters of antiquity often battle such as Gilgamesh and Enkidu, Theseus and the Minotaur, and Achilles and Hector. What if the chance was given to create a new group of heroes and have them fight in epic battle?
This is exactly the goal Gas Powered Games set upon in creating Demigod. The battles are not between a secret agents or other mere mortals. They are freaking Demigods!