There have been multiple sightings of Darkwing in Midnight City, a metropolis cast into eternal darkness by the Midnight Magician, and it's up to Invincible to investigate. He's sent into Midnight City to ask this new Darkwing to get in touch with Cecil so they can coordinate their plans to retake Midnight City. Unfortunately for Mark, Darkwing II has lost it. After a brief romp in the shadowverse, Mark takes him into custody.
Meanwhile, Angstrom Levy's plans are starting to reach fruition, but not before the Pentagon is tipped off where Mauler is. Also, Robot is up to something nefarious.