Midnight Terror

After the original Darkwing died at Omni-Man's hands, his former assistant adopted the name and costume to carry on the legacy, but the pressure warped him into a killer who began slaying innocent people. Sent by Cecil into Midnight City, Mark catches the new Darkwing hunting down a pink-haired man and stops the kill. When Mark reveals that the original Darkwing knew his father and is now dead, Darkwing II bristles, rejecting any suggestion he was a mere sidekick and refusing to go anywhere with the son of a murderer.

The fight turns on Darkwing's inherited exo-suit and his ability to vanish into a portal, striking from unexpected angles and even hurling Mark into the Shadow-Verse, a realm he warns is full of hungry things. Mark keeps his footing, seizes Darkwing during one of his attacks, and forces him to release the pull back to reality. A single decisive blow then knocks the deranged vigilante unconscious, ending the rampage.

Invincible confronts and defeats Darkwing II in Midnight City, surviving a trip into the Shadow-Verse in the process. The encounter halts Darkwing's killing spree and delivers him into custody rather than the grave.

Afterward, Cecil offers Darkwing a second chance working for the GDA, a decision that angers Mark, who wants him imprisoned. Darkwing later joins the Guardians of the Globe and eventually sacrifices himself during the Invincible War to stop a variant called Nogogglesible.

The event occurs during the second Season 2 episode, In About Six Hours, I Lose My Virginity to a Fish, set in the Thragg Era during the summer of 2023. It falls between the Levy's Paradise Lost and Underwater Trial storylines and runs concurrently with the Viltrum Empire's Expansion.

The redemption arc that follows ties Darkwing's fate to later season events, including his brief GDA service and his final stand alongside the Guardians.