Michael Holt is a billionaire and CEO of HoltCorp and a scientist.
It is revealed that Michael Holt's company, along with WayneTech and Kord Industries, have employees in Antarctica working on the Super Collider.
In Antarctica, Lois Lane is touring a Higgs Boson supercollider facility created by the combined efforts of Michael Holt and Ted Kord, with the financial assistance of Bruce Wayne. As proud as they are of their accomplishments, they tell Lois that none of it would've been possible without the last minute contribution of Lex Luthor. Lois warns them that no one should trust Lex. However, Luthor calmly tells his partners that he is only there to give.
Sadly, things don't go as planned for Kord and Holt, because when the scientists start the experiment, a violent gateway opens pulling everyone and everything into the Bleed, the rift between parallel universes, with Lois clinging to a railing. The only one who seems happy about the incident is Lex who obviously has planned everything.
After the portal is closed by Holt, with Superman and Lois already been pulled in, Holt and Kord wonder where did they went and Lex remarks he's just killed two birds with one stone.
Lex is ready to leave, saying to Kord and Holt that "he's out" as the facility is unstable, given the fact that Superman and Lois Lane disappeared. Holt says their own private security, Booster Gold, can escort his plane back to domestic airspace but Lex reveals that he lied to them and that he intends to buy Holt and Kord out. Kord says they are not selling but suddenly Lex's private security, which is revealed to be powered by rings of the Yellow Lanterns, fires at them and Lex then says they should consider it more of a hostile takeover.
Lex demands from Kort and Holt to give him the access codes for the equipment but they refuse saying that he killed Superman and Lois Lane. Lex insists his actions are to save the world and commands his security force to shoot both men when they refuse him again.
Luthor continues his hostile takeover of the Antarctica facility, convinced his actions are for the greater good of the universe. He forces the wounded Kord and Holt to work on the equipment and put it back on track.
Lex visits Kord and Holt, who say the proper adjustments are in place with the super collider to accommodate Lex's alien tech. After that, Lex's Lanterns imprison the two scientists once again along with Booster Gold, and Lex orders Otis to activate the machine so they can make some history.
Later the Lanterns suggest to kill the prisoners instead of keeping them locked up like Lex ordered them.
The Yellow Lanterns prepare to execute Ted Kord, Michael Holt, and Booster Gold, saying to them that it's not personal. Luckily, Skeets arrives just in time and attacks them with a set of cables that spring from its "body", distracting the Lanterns. Kord and Holt use the opportunity to incapacitate the men and then Skeets takes their rings. Holt and Kord help the beaten Booster Gold to stand up and comment that they might have been paying the wrong guy for the job, in which Booster Gold agrees.
In the Comics
At a young age, Michael Holt showed remarkable intelligence, reading and assimilating the works of Bohr, Einstein, Planck and Feynman, the pantheon of theoretical physics, at the age of six. He studied advanced science, space, and time "while other children struggled through Sesame Street". Michael grew up with his mentally challenged older brother, Jeffrey, whom Michael loved dearly. When Jeffrey died at the age of 15, Michael was devastated.
Holt displayed "a natural aptitude for having natural aptitudes", as he called it, easily picking up and retaining complex skills and abilities that other men spent their entire lives perfecting. Before he began his career as a superhero, he already possessed 14 Ph.D's, was a self-made multi-millionaire with a high tech firm called Cyberwear, subsequently sold to Waynetech, and was a gold medal winning Olympic decathlete.
The accidental deaths of his wife and unborn child were a devastating blow to Holt and while contemplating suicide, he was met by the Spectre, who told him about Terry Sloane, the Golden Age superhero known as Mister Terrific. Inspired by Sloane's life story, he took the name Mister Terrific and later joined the current Justice Society of America, eventually serving as its chairman.
He initially wore ordinary clothes and a leather jacket with Sloane's "Fair Play" emblem on the back. He then wears a T-shaped mask composed of electronic nanites, a black and white costume with red trim, and a collarless jacket in the same colors (the black sections of tunic and jacket forming a "T") with "Fair Play" written on the sleeves and "Terrific" across the back.
As part of One Year Later, though Holt is still a member of the JSA, he has also become part of the United Nations Security Council's intelligence agency Checkmate. He initially held the position of White King's Bishop, but when the previous White King (Alan Scott) was forced to resign, he became Checkmate's new White King, complicating his relationship with Sasha Bordeaux, Checkmate's Black Queen. He has also given up his chairman position, which has been taken over by Power Girl. Mr. Terrific has also established an ill-defined mentorship with Firestorm, over the missing year. The specifics of their meeting are yet to be documented.
In Justice Society of America vol. 3 series, Mr. Terrific takes over the research, just as the low-level villain Tapeworm appears on the news, taking hostages and demanding that Wildcat show himself. All-American Kid and King Chimera must remain in the brownstone, Mister Terrific retreats to his lab, and the rest of the team leaves to help Wildcat. All-American Kid goes into the lab and stabs Mister Terrific in the back. Justice Society members arrive back at headquarters to discover Mr. Terrific has been attacked, and Dr. Mid-Nite tends to his wounds. In the end, Mister Terrific succumbs to his injuries and Alan Scott reports that he has died. However, Scott is able to use the power of the Green Flame to slow down time around Mister Terrific's body in the hopes that he can be healed before brain death occurs. Michael is restored to life by the magic of the new Doctor Fate, and attacks All-American Kid, revealing that he is actually the teenage psychopath known as Kid Karnevil, and subdues him. For a short time during his recovery, Michael is forced to use a wheelchair, although he still found time to upgrade Mister America's whip.
In the New 52, Mr. Terrific is a solo superhero in Los Angeles and the billionaire C.E.O. of his own company. The death of his wife and his unborn son still remained part of his origin. He is also in relationship with Karen Starr.
Holt discovered that Karen Starr broke into Holt Industries computers to create a quantum tunnel. Once he gave the order to stop Karen Starr from ever setting foot in Holt Industries he jumped into the quantum tunnel and went to Earth 2. Mister Terrific had jumped into the quantum tunnel earlier and believed it to be a rift. He saw glimpses of future events. A surge knocks him from the rift and when he awakes his memory and the T-sphere's logs have been wiped. He then meets a man named Terry Sloane who takes him as a prisoner.