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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 and a minor antagonist in the 2019-2020 crossover Crisis On Infinite Earths. 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, who also portrayed Baldur in the 2018 video game God of War and Malcolm Dreyfuss in Sleepy Hollow; 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 Despite this, Deegan did not get off completely scot-free; in 2013, his medical license was revoked and he was fired from the medical board.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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Oliver Queen | Deadshot | Amanda Waller | Nyssa al Ghul | Bronze Tiger | Ragman | Vigilante | Stanley Dover | Captain Cold | Gorilla Grodd | Killer Frost (Earth-1) | Heatwave | King Shark | Time Wraiths | Black Siren | Solovar | Music Meister | Maxwell Lord | Livewire | Master Jailer | Lena Luthor | Purity | Psi | Malefic J'onzz | Monitor | Two-Bits

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Television
Season 1: Reverse-Flash | Captain Cold | General Wade Eiling | Gorilla Grodd | Caitlin Snow | The Mist | Heat Wave | Weather Wizard | Girder | Rainbow Raider | Pied Piper | Peek-a-Boo | Everyman | Clyde Mardon | Multiplex | Simon Stagg | Blackout | Clock King | Captain Boomerang | Clay Parker | Vincent Santini | The Trickster | Trickster II | Anthony Bellows | Bug-Eyed Bandit | Deathbolt
Season 2: Zoom | Reverse-Flash | Captain Cold | Killer Frost (Earth-2) | Caitlin Snow | King Shark | Dr. Light | Geomancer | The Turtle | Time Wraiths | Tokamak | Heat Wave | Atom-Smasher | Anthony Bellows | Sand Demon | Lewis Snart | Gorilla Grodd | Vandal Savage | Dark Archer | Weather Wizard | The Trickster | Tar Pit | Reverb | Trajectory | Pied Piper | James Zolomon | Griffin Grey | Rupture | Girder | Black Siren
Season 3: Savitar | Dr. Alchemy | Killer Frost | Captain Cold | The Rival | Black Flash | King Shark | Mirror Master | Top | Plunder | Gorilla Grodd | Solovar | Reverse-Flash | Magenta | Shade | Dominators | Trickster (Earth-3) |Clive Yorkin | Time Wraiths | Music Meister | Abra Kadabra | Heat Monger
Season 4: The Thinker | Marlize DeVoe | Samuroid | Kilg%re | Gregory Wolfe | Amunet Black | Matthew Norvock | Killer Frost | Black Bison | Dwarfstar | King Shark | Anthony Bellows | Peek-a-Boo | Black Arrow | Overgirl | Reverse-Flash | Prometheus (Earth-X) | Quentin Lance (Earth-X) | Trickster II | Prank | Jones | Crucifer | Siren-X
Season 5: Cicada (Orlin Dwyer & Grace Gibbons) | 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 | Goldface | King Shark | Gorilla Grodd | Godspeed | Bug-Eyed Bandit
Season 6: Bloodwork | Anti-Monitor | Eva McCulloch | Black Hole (Joseph Carver, Ultraviolet, Kimiyo Hoshi, & Sunshine) | Reverse-Flash | Frost | Mirror Clones | Monitor | Matthew Norvock | Godspeed | Pied Piper | Lex Luthor | Amunet Black | Goldface | Gorilla Grodd | Solovar | Rag Doll

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Black Manta | Brick | Bronze Tiger | Brother Blood | Catman | Cheshire | China White | Clock King | Count Vertigo | Constantine Drakon | Crumbler | Cupid | Deadshot | Deathstroke | Dr. Light | Electrocutioner | Joker | Kodiak | Komodo | League of Assassins | Longbow Hunters | Merlyn | Neron | Onomatopoeia | Professor Ojo | Professor Zoom | Prometheus | The Queen | Ra's al Ghul | Red Dart | Richard Dragon | Riddler | Royal Flush Gang | Skylark | Solomon Grundy | Stinger | Wizard

Television
Season 1: Oliver Queen | Malcolm Merlyn | China White | Edward Fyers | Billy Wintergreen | Adam Hunt | Constantine Drakon | Martin Somers | Deadshot | Jason Brodeur | Royal Flush Gang | Huntress | Frank Bertinelli | Firefly | Ted Gaynor | Count Vertigo | Amanda Waller
Season 2: Oliver Queen | Deathstroke | Isabel Rochev | Brother Blood | Anthony Ivo | League of Assassins (Nyssa al Ghul & Al-Owal) | China White | Dollmaker | Mayor | Officer Daily | Amanda Waller | Count Vertigo | Cyrus Gold | H.I.V.E. (Milo Armitage) | William Tockman | Suicide Squad (Bronze Tiger, Deadshot & Shrapnel) | Huntress | Frank Bertinelli | Clinton Hogue
Season 3: Oliver Queen | League of Assassins (Ra's al Ghul, Maseo Yamashiro, Nyssa al Ghul & Chase) | Matthew Shrieve | Amanda Waller | China White | Werner Zytle | Komodo | Cooper Seldon | Captain Boomerang | Roy Bivolo | Danny Brickwell | Deathstroke | Michael Amar | Joseph Cray | Suicide Squad (Deadshot & Cupid) | H.I.V.E. (Mina Fayad) | Jake Simmons
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 | Lex Luthor

           Supergirl second logo Villains

Comics
Alphina | Appex | Barry Metznerr | Belinda Zee | Bizarro-Girl | Black Banshee | Black Flame | Blackstarr Blithe | Brainiac | Buzz | Carnivore | The Council | Cyborg Superman | Dark Angel | Darkseid | Dark Supergirl | Decay | Delacore | Despero | Diasporans | Dollmaker | Emerald Empress | Eradicator | Female Furies | The Gang | Graviton Man | H'el | Hecate | Incest Queen | Indigo | Kryptonite Man | Lesla-Lar | Lex Luthor | Lobo | Mxyzptlk | Nasthalthia Luthor | Nightflame | Positive Man | Psi | Reactron | Reign | Roho | Satan Girl | Selena | Silver Banshee | Simon Tycho | Superwoman | Twilight | Wordkiller-1 | Xenon

Movie
Selena

Television
Season 1: Astra and Non's Army (Non, Astra, Indigo, Vartox, Hellgrammite & Maxima) | Maxwell Lord | Reactron | Livewire | Ethan Knox | Red Tornado | T.O. Morrow | Jemm | Dirk Armstrong | Bizarro | Toyman | Miranda Crane | Master Jailer | Silver Banshee | Project Cadmus (Colonel James Harper)
Season 2: Queen Rhea | Project Cadmus (Lillian Luthor, Cyborg Superman & John Corben) | Scorcher | Roulette | Parasite | Dominators | Phillip Karnowsky | Livewire | Mister Mxyzptlk | Music Meister | Beth Breen | Rick Malverne | Lex Luthor
Season 3: Worldkillers (Selena, Reign, Purity, Pestilence & Thomas Coville) | Morgan Edge | Bloodsport | Psi | Dominators | New Reich (Black Arrow, Overgirl & Promethus) | Eobard Thawne | Red Tornado | Livewire | Lillian Luthor | Red Daughter
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) | Hellgrammite | Monitor | John Deegan | A.M.A.Z.O. | Psycho-Pirate | Leviathan (Eve Teschmacher & Margot Morrison) | Red Daughter | Phil Baker | Lillian Luthor | Malefic J'onzz
Season 5: Leviathan (Gamemnae, Rama Khan, Tezumak, Sela, Andrea Rojas, Margot Morrison, & Eve Teschmacher) | Lex Luthor | Malefic J'onzz | Lena Luthor | Lillian Luthor | Anti-Monitor | Midnight | Shadow Demons | Toyman | Mister Mxyzptlk | Worldkillers (Selena, Reign, & Thomas Coville) | Children of Liberty (Agent Liberty & Otis Graves) | Dominators

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