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My name is Dr. John Deegan, and I, like most of you, I'm a psychiatrist. Do you know what my patients tell me the most? They feel inferior. I'm here to tell you, whether we admit it or not, some people, they're just born lucky, which leads us to the real problem, imperfection. How can we ever hope to feel like supermen or superwomen without first becoming super ourselves?
~ John Deegan

John Deegan is one of the main antagonists (alongside Mar Novu) of the 2018 Arrowverse crossover, Elseworlds. He was the lead Arkham Asylum psychiatrist who was given the Book of Destiny by the Monitor, in which he uses to warp reality in his own image.

In his original form, he is portrayed by Jeremy Davies, and while as Superman, he is portrayed by Tyler Hoechlin.

Biography

Early life

Deegan was born and raised in Gotham City. He graduated with a Ph.D. and an MD in psychometrics and became a psychiatrist at Arkham Asylum. His methods were bordering on torture conflated with illegal experimentation, however, he was never convicted and avoided prison over the years; due to technicalities. Despite this, Deegan did not get off completely scot-free; in 2013, his medical license was revoked and he was fired from the medical board.

The Mad Scientist

One evening, Deegan was giving a presentation on his patients and how they could become Meta-humans with the help of eugenic insights, but his audience then perceived him as insane and left before he even started elaborating, much to his disappointment and frustration. As he walked in the parking lot, he was approached by the Monitor, who Deegan thought was a prankster trying to get some laughs, before Novu smashed his car to demonstrate his power and get his attention. When Deegan asked what the individual was, he remarked that he was something beyond his comprehension. The Monitor then gave Deegan the Book of Destiny, granting him the power to manipulate reality as he sees fit.

He tried to reshape reality to become The Flash, but miscalculated and caused Oliver Queen and Barry Allen to swap powers and identities.

Meeting the Heroes

When Oliver showed up at Deegan's office in Arkham, he recognized and told him that he understood why he didn't become the Flash, stating that changing reality must have a "learning curve". As Oliver ordered him to fix reality, Deegan answered that he doesn't want to and runs away after releasing Arkham's inmates. When he retrieved the book from its hiding spot and was about to rewrite reality,[Kara Danvers appeared and took the book from him, to which he quickly escaped.

Later, the Monitor appeared to Deegan once more in his lab holding the Book and asking him to think bigger. Deegan rewrote reality, on a larger scale.

A Brave New Elseworlds

After rewriting reality again, Deegan kept the book in the Time Vault, dubbed the "Fortress of Solitude", jumbled everyone's lives, turned Oliver and Barry into criminals known as Trigger Twins, and took on the form of Clark Kent, whose only record on Earth-1 was with his fight with A.M.A.Z.O. He then pursued the Trigger Twins but was distracted when they caused an accident where he had no other choice but to protect the civilians and let them escape. Later at S.T.A.R. Labs, where he redesigned it as his headquarters, he ordered his agents, John Diggle and Caitlin Snow, to find them.

He proceeded to the S.T.A.R. Labs particle accelerator and conversed with "Subject One", Kara Danvers, who he locked up and drained off of her powers for himself, leaving Kara with a weaker version of her abilities. He revealed to her how he got the idea of his appearance and powers. Kara, in a rage of Deegan's desecration of her family crest and her cousin, tried to break the glass, before Deegan's agent, Alex Danvers, administered a high-pitched sound to throw her off-balance, to which Deegan stated that the cells are patrolled 24/7. When agent Danvers left, Kara tried to call out to her, and much to Deegan's amusement, he threatened his own agent's life if Kara got any bright ideas of escaping, to which Kara called her a monster. Deegan said he was otherwise Superman.

Later, he caught Alex Danvers breaking out Kara Danvers and was about to kill them when Barry, Oliver, Cisco, and Clark breached inside S.T.A.R. Labs just in time for Clark to distract him. The two supermen battled within Central City, and civilians perceived them as Superman fighting one of his enemies, Bizarro. Deegan overpowered Clark and was about to finish him off, when Kara used her heat vision to throw Deegan into the air, and gave the Book of Destiny to Clark, restoring Barry's, Oliver's, and Kara's powers and abilities. Deegan saw this and threatened to snap Barry's neck if Clark didn't close the book. Oliver countered this by threatening to shoot a Kryptonite arrow, but let Barry talk him down to do otherwise. Deegan then saw an opening to create a thunderclap and escaped with the book.

Deegan tried to restore his Elseworlds in the middle of a crowded street, where police officers tried to stop him from causing mayhem but were turned into helpless taxi drivers. He then summoned A.M.A.Z.O. from the Book of Destiny and kept Superman at bay, when J'onn J'onzz, Lois Lane, and Querl Dox breached in to assist, before A.M.A.Z.O. locked in battle with Brainy. Lois used the Solar hammer from the Fortress of Solitude and kept Deegan off-balance, but not long enough for Clark to take hold of the book. Deegan retrieved the book and aimed it's energy at Clark and then at Lois, sending her flying. Barry and Kara successfully slowed downtime, which gave Oliver the chance to shoot the book with a powerful arrow of metaphysical nature, overloading it with energy and destroying its powers, and reverting reality to its original state. The accumulation of energy also disfigured Deegan's face and cognitive abilities.

Inmate at Arkham

John was then locked up at Arkham Asylum, this time as a patient, where he became friends with Roger Hayden, who told him not to worry as, due to his to actions, "the stage was set" and soon "worlds will live, worlds will die, and the universe will never be the same".

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Season 5: Cicada (Orlin Dwyer, Grace Gibbons, & David Hersch) | Reverse-Flash | Vanessa Ambres | Jones | Icicle | Weather Wizard | Killer Frost | Rag Doll | Monitor | Zoom | Savitar | The Thinker | Clyde Mardon | John Deegan | A.M.A.Z.O. | Psycho-Pirate | Matthew Norvock | Peek-a-Boo | King Shark | Gorilla Grodd | Godspeed | Bug-Eyed Bandit
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Season 4: Oliver Queen | H.I.V.E. (Damien Darhk, Ruvé Darhk, Malcolm Merlyn, Andrew Diggle, Milo Armitage, Phaedra Nixon, Mina Fayad, Thomas, Demolition Team, Michael Amar, Danny Brickwell & Cooper Seldon) | Shadowspire (Baron Reiter, Conklin & Joyner) | Amanda Waller | Lonnie Machin | Jeremy Tell | Rogue Anti-Vigilante Task Force (Liza Warner) | Vandal Savage | Calculator | Cupid | Brie Larvan | Evelyn Sharp
Season 5: Oliver Queen | Prometheus | Talia al Ghul | Evelyn Sharp | Black Siren | Konstantin Kovar | Ishmael Gregor | Tobias Church | Lonnie Machin | Ragman | Janet Carroll | J.G. Walker | Derek Sampson | Scimitar | Vigilante | Dominators | Laura Washington | Hideo Yamane | Sean Sonus | James Edlund | China White | Liza Warner | Cupid | Anatoly Knyazev | Captain Boomerang | Justin Claybourne
Season 6: Oliver Queen | (Ricardo Diaz, Black Siren, Anatoly Knyazev, Kimberly Hill & Sam Armand) | Cayden James | Sheck | Vigilante | Alex Faust | Jackals (Joe Wilson & Nylander) | Black Arrow | Overgirl | Eobard Thawne | Prometheus (Earth-X) | Quentin Lance (Earth-X) | Athena
Season 7: Oliver Queen | Ninth Circle (Emiko Queen, Dante, Virgil & Beatrice) | Kevin Dale | Ricardo Diaz | Longbow Hunters (Red Dart, Kodiak & Silencer) | Stanley Dover | Danny Brickwell | Derek Sampson | John Deegan | Monitor | A.M.A.Z.O. | Psycho-Pirate | Ghost Initiative (Joe Wilson, China White & Cupid)
Season 8: Oliver Queen | Anti-Monitor | Deathstroke Gang (John Diggle, Jr., Grant Wilson) | Monitor | Athena | Edward Fyers | Billy Wintergreen | Shadow Demons

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Season 3: Worldkillers (Selena, Reign, Purity, Pestilence & Thomas Coville) | Morgan Edge | Bloodsport | Psi | New Reich (Black Arrow, Overgirl & Promethus) | Eobard Thawne
Season 4: Lex Luthor | Children of Liberty (Agent Liberty, Mercy Graves, Raymond Jensen & Natalie Hawkings) | Otis Graves | The Elite (Manchester Black, Pamela Ferrer, The Hat & Morae) | Monitor | John Deegan | A.M.A.Z.O. | Psycho-Pirate | Eve Teschmacher | Red Daughter | Phil Baker
Season 5: Leviathan (Andrea Rojas) | Malefic J'onzz | Lena Luthor | Hope | Anti-Monitor | Midnight

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