Thanos and Darkseid finally cross paths as they decide to takeover the DC multiverse together along with the Marvel universe in which both have once again achieved great power and they run into Lucifer Morningstar along with his brother Michael who plan on putting an end to their scheme under the order of The Presence.
Thanos has HOTU
Darkseid has the Anti-Life Equation
All are at full power
Takes place in the DC universe within a separate realm and galaxy