Brockalizer
Dr. Doom accidentally stumbles across the DC universe. He encounters Larfreeze, battle ensues and long story short he ends up with the Orange Power Ring. Apon his returned he uses his new found power to kill and copy the Fantastic Four, Avengers, X-Men, and Hulk Family allowing for his inevitable conquest of Earth and eventually the Marvel Universe itself. He then sets his sights on the DC Universe, starting with Earth. Using only the avatars of the Marvel Earth teams can he conquer: (In no particular order)
1. DC Earth
2. Oa
3. New Genesis
4. Apokalips
1. DC Earth
2. Oa
3. New Genesis
4. Apokalips