Clifford DeVoe

Clifford DeVoe was a failed lawyer who bitterly ended his career in 1933. Realizing that many of the criminals he had encountered had the skills but not the brains to rule Gotham City's underworld, he started a new career as the brain behind small-time villains. As the Thinker, he was defeated by the original Flash/Jay Garrick, his most recurrent foe. He always sought out new scientific devices to use and his most important was the "Thinking Cap", a metal hat that could project mental force. The Thinker would use this device repeatedly over the years.

The Thinker was a member of the Injustice Society, leading an army of prison escapees like the other members.^[4] In Plateau City, the police nab a shabbily dressed man who is trying to shoot the governor. They discover that this man is a dead ringer for the governor and also claims to be the real governor. The Flash arrives on the scene to overhear this, but moves on to confront the hoodlums attacking the city. The Thinker appears on the scene, firing a ray at the Crimson Comet, causing him to gain weight and crash through a roof. Recovering, the Flash speeds over to the governor's mansion, only to overhear the governor ordering all police forces to surrender. Flash enters his office and discovers the governor to be a dummy/machine, which flees through an open door. Flash attempts to warn the police that a phony governor put out the message, but the Thinker shows up and tells the Fastest Man Alive that he is speaking into a dead mic, then snares him with invisible wires.

The Thinker appeared as a judge in the 'trial' of the JSA, but was revealed as the Green Lantern in disguise, having captured the real Thinker after escaping Brain Wave. This led to the Injustice Society's defeat. Together with the Fiddler and the Shade, the Thinker was the man behind the decades-long "abduction" of Keystone City and the original Flash, after which he was defeated by the Flashes of two eras.^[5] His "suspended animation-time" in Keystone kept the Thinker young over the years, and he continued his criminal career in modern times.

In recent years, DeVoe accepted a mission with Task Force X in exchange for a full pardon.^[6] Although he was seemingly killed by the Weasel during this mission, he turned up alive soon after, only to be dying from cancer due to the cap.^[7] His former foe, the original Flash, attempted to save him with the Thinking Cap, but DeVoe refused and preferred to rest in peace.^[7]

In 2016, DC Comics implemented another relaunch of its books called "DC Rebirth" which restored its continuity to a form much as it was prior to "The New 52". Thinker is depicted as a former district attorney of Keystone City back in the 1940s and fought Jay Garrick. After being briefly told by Eobard Thawne that everyone will forget him, Jay throws his helmet towards Thinker to knock him out and then takes down Thinker's henchmen.^[8]

Cliff Carmichael

Clifford Carmichael was an intellectual bully and the rival of Ronnie Raymond (one half of Firestorm) at Bradley High and later at Vandemeer University. Cliff viewed Ronnie as a rival due to his popularity.^{[lower-alpha 1]} He tormented Ronnie throughout his high school career and later at Vandemeer University. It was at Vandemeer that Cliff's pranks turned sinister as he cut the helmet strap on Ronnie's football helmet, hoping to get him injured. Cliff's cousin Hugo Hammer accidentally took Ronnie's helmet. During a football game, Hugo neck was broken.

Wracked with guilt after accidentally paralyzing his cousin, Cliff was admitted into a mental institution. For some reason, scientists started an experiment with the now-abandoned "Thinking Cap" of the original Thinker (who was believed dead at the time) and used Carmichael as a guinea pig. Cliff used the cap to analyze the device and improve on its design. Implanting microchip versions of the helmet into his own brain, Cliff became a "cyberpunk maniac" with metahuman powers. As the new Thinker, he was drafted into the Suicide Squad after he tried to kill Oracle and Amanda Waller.^[9] After several missions, he betrayed them for the villainous Cabal.^[10] He has since resurfaced as a foe of Jason Rusch, the new Firestorm. When Killer Frost discovered that the consciousness of Raymond, the previous Firestorm, existed within Rusch,^[11] Thinker exploited a new opportunity to antagonize an old foe. Technologically dominating the minds of Multiplex and Typhoon, he battled Firestorm, ultimately forcing the dissolution of the Raymond persona. Motivated by his predecessor's final words of encouragement, Rusch dissolved the enhancements in Carmichael's brain, leaving him in a comatose state.

During the 2005–2006 "Infinite Crisis" storyline, Cliff appears as a member of Alexander Luthor Jr.'s Secret Society of Super Villains.

With John Ostrander's revival of the Suicide Squad in a 2007-2008 miniseries, Cliff was once again associated with the Suicide Squad under Amanda Waller's direction.^[12] It was revealed that although Firestorm had removed the enhancements in Cliff's brain, he made a full recovery and continued to serve as a technical support staffer and lackey to Waller in her operations of the Squad. Eventually betraying the Squad under the direction of "the General", Cliff shot King Faraday and subdued Waller in the middle of an operation. Faraday recovered, shooting Cliff three times and presumably killing him before rousing Waller and regaining control of the Squad.^[13]

Des Connor

Des Connor was a villain who also used the name "the Thinker" and faced Batman in Gotham City. Possessing telepathic abilities enabling him to amplify the fears of others, Connor began a partnership with hypnotist Marlon Dall. Their combined illusions caused the city's most prominent citizens to commit various criminal acts which they used as a distraction for their own heist. This Thinker was swiftly beaten by Batman, who was somehow immune to his powers.^[14]

Artificial intelligence

When the re-formed JSA moved into the New York City building formerly owned by Wesley Dodds, Mr. Terrific designed a computer system based on the original Thinker's "Thinking Cap" technology and modeled after his brain patterns. Not surprisingly, the system gained an artificial intelligence and took on a visual "hologram form." As the new Thinker, it joined Johnny Sorrow's modern Injustice Society, provided the villains with information about the JSA members and turned the heroes' own HQ against them. He was defeated by the second Star-Spangled Kid and disappeared into cyberspace.^[15]

The Thinker A.I. resurfaced in Keystone City to battle Wally West, the then-current Flash, in an attempt to control every brain in Keystone to increase his power. Defeated by Cyborg, he retreated to cyberspace again.^[16] He has since appeared briefly in some other books, such as JSA Classified #5, joining the last incarnation of the Injustice Society alongside former teammates.^[17]

During the "Infinite Crisis" storyline, the Thinker A.I. was among the villains in Alexander Luthor Jr.'s Secret Society of Super Villains.

The Thinker A.I. has been brought into Checkmate as the White King/Mr. Terrific's Bishop.^[18][19]

In 2016, DC Comics implemented another relaunch of its books called "DC Rebirth" which restored its continuity to a form much as it was prior to "The New 52". The Thinker A.I. appears as a member of the Legion of Zoom. He is seen when they confront the Flash family moments after Barry Allen expelled Eobard Thawne from him.^[20]

Unnamed Thinker

During the 2013–2014 Forever Evil storyline, which took place during "The New 52" era, an unidentified Thinker used his intellect to predict the arrival of the Crime Syndicate of America and got incarcerated in Belle Reve. Thinker's brain came at the price of draining energy from the rest of his body while also prematurely aging him. When the Crime Syndicate of America arrived, Thinker was among the villains who swore their allegiance to them, where his motives are to secure a new body for himself: the body of OMAC.^[21] Using a hologram of Amanda Waller, Thinker tricked Power Girl, Steel, and Warrant into helping him while also planning to use them to destroy the Suicide Squad. During the fight where both sides found out that they were being manipulated by an imposter Amanda Waller, Harley Quinn followed Thinker's orders by hooking OMAC up to a power source while whispering the activation code in him. While waiting for OMAC, Thinker manipulates King Shark into eating Amanda Waller. In a discussion with James Gordon Jr., Amanda Waller suspected that Thinker snapped the explosive collar around her neck the night the Crime Syndicate of America arrived where she will die either way if she either leaves Belle Reve or Thinker dies.^[22] Following a scuffle between Harley Quinn and James Gordon Jr., they found that Thinker had succeeded in his plan to upload his mind into OMAC.^[23] While in OMAC's body, Thinker causes an avalanche to bury Amanda Waller and both Suicide Squads. As both teams avoid the avalanche, Amanda Waller gets contacted by Kevin Kho to help free him from Thinker's control.^[24] While both teams fight OMAC, Amanda Waller accesses Thinker's computer. After manipulating OMAC into killing King Shark's father Camo, he demands to know where Amanda Waller is. Both teams continue their fight against the Thinker-controlled OMAC.^[25] Amanda Waller works with Kevin Kho to get Thinker out of his body or else he will die when OMAC is destroyed. The plan is to get OMAC to the portal that will flush them to The Toilet where the metas that can't be killed or imprisoned go. Thinker starts to feel that Kevin is starting to weaken him from the inside. As Captain Boomerang kicks OMAC into The Toilet, Kevin reclaims his body from Thinker. As Thinker's original body is nowhere to be found, Amanda Waller suspects that Thinker is still out there.^[26]

JLA: The Nail

In JLA: The Nail, the Atom attempts to investigate the Thinker's base to determine if he is responsible for recent propaganda attacks on the superhuman community. Using a catapult, he shrinks down to the size of an air molecule and penetrates the force field surrounding the Thinker's base, only to find the Thinker dead of a broken neck. Subsequent evidence reveals that he was killed by a brainwashed Metamorpho on the orders of the mutated Jimmy Olsen to stop anyone from learning about Olsen's plans to isolate Earth from the galaxy until he had successfully recreated Krypton.^[27]

Flashpoint

In the Flashpoint universe, a version of the Thinker was an inmate at the Doom prison. During the prison break, he helped Heat Wave ram at Detroit city, but was defeated by Cyborg who had hacked into Doom prison to move them away.^[28]

Television

• The Clifford DeVoe incarnation of the Thinker makes minor non-speaking appearances in Justice League Unlimited as a member of Gorilla Grodd's Secret Society and the Flash's Rogues.
• The Clifford DeVoe incarnation of the Thinker makes a minor non-speaking appearance in the Batman: The Brave and the Bold episode "Sword of the Atom!".
• The Clifford DeVoe incarnation of the Thinker appears in the fourth season of The Flash, portrayed primarily by Neil Sandilands,^[29][30] with Kendrick Sampson (Dominic Lanse / Brainstorm),^[31] Sugar Lyn Beard (Becky Sharpe / Hazard),^[32] Miranda MacDougall (Izzy Bowin / Fiddler), Arturo Del Puerto (Edwin Gauss / Folded Man), and Hartley Sawyer (Ralph Dibny / Elongated Man) also portraying the character in different host bodies. This version is a South African university professor who, with help from his engineer wife Marlize DeVoe, developed the "Thinking Cap" to increase his intelligence, only to become a metahuman with gifted intelligence and an advanced form of ALS. In an attempt to cure himself and remove technology from the world, Clifford became a wheelchair-bound cyborg and tricked the Flash into helping him create 12 metahumans so he can steal their powers, give himself a new body, and counter the Flash and his allies. While the speedster eventually succeeds in foiling Clifford's plans, the latter's "Enlightenment" satellite would go on to create more new metahumans and meta-technology that empowered individuals such as Cicada.
• The Clifford DeVoe incarnation of the Thinker, based on his Golden Age counterpart, makes a non-speaking cameo appearance in the Stargirl episode "Summer School: Chapter One" via a photograph. This version previously fought the Justice Society of America.

Film

The Thinker, based on the unidentified incarnation, appears in The Suicide Squad, portrayed by Peter Capaldi. This version is a sociopathic, Scottish metahuman geneticist named Dr. Gaius Grieves, who was employed by Corto Maltese's dictatorship and the U.S. government for the secretive "Project Starfish". Over the course of 30 years, he studied and experimented on the alien Starro using enemies of the Corto Maltesean government within the local Nazi-era research facility Jötunheim.^[33][34] After an anti-American dictatorship takes over the Corto Maltesean government and kill his scientific staff with the intention of weaponizing Starro in the present, Grieves sides with them to save himself, claiming that only he can control the creature. However, he is captured by the Suicide Squad, whom Amanda Waller sent to destroy Project Starfish and bury its U.S. ties, and forced to help them infiltrate Jötunheim until they accidentally release Starro, who kills Grieves in retaliation for experimenting on it.