Flash, Bones, and Angel have just followed demon Agramon through the temple portal, and emerged into a strange and fiery realm filled with all kinds of terrible monsters.

They make a plan to find the demon's lair by splitting up. While searching, Flash unknowingly attacks a zombie pigman, triggering a swarm of others coming to kill him.

At the same time, Bones and Angel are bombarded by Ghasts and other creatures of the Nether. All sides are struggling in this evil place.

Can they find and destroy Agramon before being blown up, chopped to pieces, or falling into deadly lava? Will the demon stronghold have the final ingredient they've been searching for?