Doctor Mid-Nite

Aboard Hourman's timeship, Metron explained to Mid-Nite and the JSA that Extant used Metron's stolen Mobius Chair to travel to the end of creation and create a new universe of his own making. Unless the JSA stopped him, Extant's new universe would go backwards through time and erase the current universe.

Dr. Mid-Nite and Black Canary went on a date at Coney Island and discussed where their relationship was going.

During the Imperiex War, Mid-Nite, the JSA, and the JSA reserves were given a mission by President Luthor to disrupt Imperiex's link to his ship's power supply. The JSA not only cut off Imperiex from his power, but they managed to blow up his ship as well.

Mid-Nite and Mr. Terrific examined a woman under a sleeping spell that their JSA teammate Dr. Fate believed to be his wife Lyta. They had no idea how to treat her, so Fate lost his temper and stormed off to search for his own solution.

Mid-Nite got caught up in a battle between Atom-Smasher and probationary JSA member Black Adam. Captain Marvel arrived at JSA hq and physically restrained Black Adam, calming him down in the process. Because of a dispute between the current JSA chairman Sand and Hawkman, the JSA elected Mr. Terrific as their new JSA chairman, and immediately afterwards Mid-Nite and most of the JSA were teleported by Roulette to her House.

Roulette forced Mid-Nite and his JSA teammates to battle each other for the amusement of a crowd of super villains. Mid-Nite and Mr. Terrific were strapped into chairs and pitted against each other in a game of chess, with Roulette promising death to the loser. Mid-Nite and Terrific intentionally played to a draw, then escaped. The JSA wrecked Roulette's House, so she teleported them back to JSA hq with a promise that they would play in her games again.

Mid-Nite and the JSA next investigated the death of super villain Shakedown. Batman joined them, letting them know Shakedown and his partner New Wave had kidnapped Jessica Weintraub, the infant daughter of a recently bankrupt Gotham computer whiz. When the villains realized they weren't going to get paid their ransom they turned on each other. Batman and the JSA saved Jessica and captured New Wave. Black Canary left the JSA and told Mid-Nite she needed to break off their relationship because an old flame had reentered her life.

Mid-Nite gave new JSAer Power Girl a full physical and determined that her powers were not magic-based as she previously believed. Mid-Nite and the JSA welcomed Johnny Thunder, who claimed to have had a miraculous recovery from Alzheimer's. In truth it was the Ultra-Humanite in possession of Thunder's body.

The Ultra-Humanite used Johnny Thunder's Thunderbolt to conquer the world, and imprisoned Mid-Nite and virtually every superhuman on Earth in stasis tubes, only reviving them when he needed mind-controlled slaves to serve in his personal guard: The Thunderfront. Mid-Nite served as a member of the Thunderfront when they attacked the JSA, the only heroes not under the Humanite's control. The JSA used a device that disrupted the braincaps Humanite used to control the Thunderfront, freeing them from Humanite's mental domination. Mid-Nite and the JSA later defeated the Humanite, and afterwards attended the funeral of Johnny Thunder, whose body gave out after he was freed from the Humanite's control.

Dr. Mid-Nite is one of the most prominent physicians in the world, along with his JSA teammate and colleague Mister Terrific. They are often called upon when an autopsy is needed, or when a hero needs major surgery. In this roll Pieter has accomplished many notable achievements including: determining that Alan Scott was composed of the green flame of the Starheart; giving Power Girl her annual checkups, as well as testing her powers; emergency surgery on Hourman; removal of the Brainiac virus from Oracle; the autopsy of Sue Dibny and removing the sniper bullet that wounded Lois Lane in Umec. He is also called upon by other medical agencies, such as S.T.A.R. Labs, when medical emergencies or dilemmas appear.

Mid-Nite went to the Gotham General Hospital along with Mr. Terrific to take care of Selina Kyle after Hush removed her heart from her body. When Batman recovered the heart, Mid-Nite and Terrific performed a successful surgery on Selina to put her heart back, but afterwards, they weren't sure if she would ever be Catwoman again.

When the Justice Society encounter Gog, last survivor of the Third World, the benevolent being restores Pieter's vision.

Since his sight was restored, Pieter could not effectively use his blackout bombs, as he couldn't see any more than his targets could. Furthermore he felt more blind than ever as he had less ability to see than he did prior to his returned sight, and thus could not perform surgery on Lance when he was mortally wounded, or determine the accuracy of a patients ailment when he returned to work at the hospital.

When the rebellious half of the JSA shows up to tell the other half what Gog is doing to the planet, a battle ensues. For the JSA's defying of Gog and his will, he undoes all the "miracles" he has done for them. Thus returning Cross's blindness.

Doctor Mid-Nite performed the autopsy on Bruce's supposed skeleton to confirm that it was him on the request of Clark Kent and Wonder Woman, after he was struck by Darkseid's Omega-Beams.