I knocked this out over a couple of days of thinking and writing. It is for Pulp City and pits Heroes against Villains in a battle that could protect or endanger the Earth depending on who is victorious. No pressure there, then!
There are 3 linked Encounters which are pretty straight-forward with a few special rules for each.
For anyone interested in playing through them, here is the PDF document link: The Deathly Abyss.