Here we finish up Mephisto's realm by dealing with both Blackheart and the big man himself as well as make some tough decisions and learn a bit more of what Doom is up to slightly and then we see mayhem happen. There were tons of mentioned potential encounters we could've had here but those didn't happen. Basically a way to keep initial players wondering just what'll happen. But we get Ms. Marvel back and it's the only real to get the character unlock message at this point since I have everyone unlocked so I only get that message when I defeat Mephisto after swapping someone out for Ghost Rider. You actually can swap out Ghost Rider for Ghost Rider and suffer no penalties or glitches, but I never tried having "two Ghost Riders" and I didn't want to tempt fate that much.