Earth-Prime
John Thomas Diggle was born in 1977 in Starling City. He had a younger brother, Andy Diggle, but their relationship was always very tense. During his childhood, his father died on a military mission in Vlatava. He blamed his father's death on his step-father, who was in charge of the mission, Roy Stewart. Roy would train intensively both John and Andy on military combat. In 2003, he joined the United States Army, and was sent in Afghanistan, two years later becoming a Sergeant. When he discovered that Andy was a drug dealer, he beat him up, and convinced him to join the army. With both serving in Afghanistan, at some point Lt. Joyner offered them a deal to confiscate some of the opium they recovered and sell it off, a deal John refused, but not Andy. At some point, he met with Lyla Michaels in Afghanistan, and got married. At the end of his second tour, they divorced. John went back to Afghanistan for a third tour, while Lyla joined A.R.G.U.S. In 2008, he retired from the Army, and in 2010 he started working as a security guard, with his first job being protecting Tommy Merlyn. Sometime later, his brother was killed by Deadshot, and as a result he grew closer to his brother's widow, Carly Diggle.
In season 1, John Diggle was introduced as a former United States Army Ranger and United States Army Special Forces soldier, honorably discharged at the rank of Master Sergeant in the pilot episode. He is hired as the bodyguard of billionaire Oliver Queen by his mother, Moira and later becomes his confidant in his mission to save Starling City. Diggle tries to help Oliver balance his normal life and vigilante life, and occasionally helps him in the field. Diggle provides Oliver with medical assistance, limiting his need for hospital treatment. Already a skilled fighter, Diggle receives additional training from Oliver. Diggle has a grudge against Floyd Lawton / Deadshot who allegedly killed his brother, Andy. Diggle dates his brother's widow, Carly, and is a father figure to her son, Andrew "A.J.", during this season.
In season two Diggle and Felicity Smoak continue to help Oliver with his crusade and Diggle continues to be Oliver's adviser and field partner, along with Sara Lance and Roy Harper. Diggle has a relationship with his ex-wife Lyla Michaels, is an unofficial member of A.R.G.U.S., and a member of the Suicide Squad under the codename "Freelancer". He also develops an uneasy alliance with Amanda Waller who occasionally asks him for field assistance with A.R.G.U.S. missions. In the season finale, it is revealed that Lyla is pregnant with Diggle's child.
Diggle continues to help Oliver and his team during season three, but has to devote more of his time to his new baby with Lyla, whom he names Sara after Sara Lance is killed. After Lyla is seriously injured in an attack, they decide to remarry. When Oliver is presumed dead at Ra's al Ghul's hands, Diggle leads Felicity, Roy, and Laurel Lance until his friend's return. After Oliver's return, Diggle accompanies him to Nanda Parbat to help him free Malcolm Merlyn, but the two are captured. Diggle and Lyla marry after a near-death experience with the Suicide Squad, when Lawton sacrifices himself for them. Diggle and Lyla decide to quit Team Arrow and A.R.G.U.S. for their daughter's sake. After Oliver leaves the team to join the League of Assassins as part of a deal to revive a near-deceased Thea Queen, Diggle becomes the team leader, though he is not yet ready to forgive Oliver for kidnapping Lyla as part of a deception to gain acceptance by the League. In season one of The Flash, Diggle arrives at Central City with Oliver and Felicity to locate a criminal who uses lethal boomerangs (Digger Harkness), but ends up assisting Team Flash (Barry's team) in defeating Roy Bivolo.
Season four sees Diggle continuing to protect Starling City, now renamed Star City, with Laurel and Thea. Now going by the codename "Spartan", he discovers that the organization that targets the newly named Star City is H.I.V.E., who had hired Lawton to murder Andy. Diggle eventually forgives Oliver after their fight with a H.I.V.E. metahuman operative named Jeremy Tell. With Quentin Lance's help, Diggle learns that Damien Darhk had Andy murdered, and that he was a drug cartel leader and Darhk's territorial rival prior to his death. However, Diggle discovers that Darhk actually faked Andy's death and recruited him as a H.I.V.E. soldier, leading Diggle and his brother to become enemies. Guilt-ridden over his brother's role in causing Laurel's death, Diggle seeks revenge against Andy and Darhk. Diggle kills Andy after the latter threatens to harm Lyla and Sara. He initially lies to Lyla that he killed Andy in self-defense, but Oliver encourages Diggle to admit the truth to his wife. Diggle rejoins the army after confiding to his wife and Darhk's defeat.
In season two of The Flash, Diggle and the rest of Team Arrow aid Team Flash during their fight with Vandal Savage. Later in the season, when the metahuman King Shark escapes from his A.R.G.U.S. prison and arrives at Central City to kill Barry, Diggle and Lyla arrive to warn the latter. After King Shark is defeated by the combined efforts of Team Flash, Diggle and Lyla, he is taken back to A.R.G.U.S.
In the second episode of season five Diggle is betrayed by his commanding officer, J.G. Walker, following a failed attempt to sell nuclear weapons. Framed for Walker's crimes, Diggle is arrested. Oliver and Lyla break him out of state prison, and Diggle stays at H.I.V.E.'s former base until his innocence can be proven. Diggle remains guilty about killing Andy and continues to serve as Spartan to redeem himself. Due to the events of The Flash episode "Flashpoint", Diggle's family history is altered: his daughter Sara has been erased from existence and replaced by John "J.J." Diggle, Jr., as a result of a timeline change caused by Eobard Thawne, correcting the Flashpoint reality created by Barry Allen. Felicity is later able to prove Diggle's innocence by restoring the digital files that Walker had destroyed. However, Andy's betrayal and death at Diggle's hands has taken a toll on him; he struggles to control his rage and occasionally pulverizes criminals to vent it, fueling Oliver's concern over his erratic behavior. Diggle later befriends Oliver's chosen successor to Laurel's mantle, Dinah Drake, a Central City detective, and encourages her to set down roots in Star City. Diggle, along with the rest of Team Arrow, is later captured by Adrian Chase and taken to the island Lian Yu. Chase later detonates the explosive-rigged Lian Yu by shooting himself dead, with Diggle still on the island.
In season three of The Flash, Diggle joins forces with other superheroes to stop an alien invasion, while he learns of the alteration of his life with Lyla, his daughter's erasure and his son's status as a time aberration, and despite the hurt caused by these circumstances, he chooses to forgive Barry.
The season six premiere reveals that Diggle survived the explosion by taking shelter in a plane like the others. However, he was wounded by bomb shrapnel and suffers a degenerative nerve injury that affects his motor control that requires taking daily medications, resulting him to develop a drug dependency. When Oliver decides to retire from being the Green Arrow, he appoints Diggle as his successor, oblivious to the fact that Diggle is not in condition to remain in action. Oliver returns to vigilantism until Diggle is fully recovered from his injury. Curtis Holt develops an implant for Diggle to help him control his tremors as he progressively recovers. After Oliver decides to remain being the Green Arrow, Diggle accepts the job offer from Lyla as one of the commanding officers in A.R.G.U.S., using his new position to lead his subordinates to maintain order in the city's police's place due to them having been compromised by crime lord Ricardo Diaz. Near the end of the season, Diggle is fully healed and no longer needing Holt's implant. His A.R.G.U.S. team later joins forces with FBI agent Samanda Watson's subordinates, and working with Team Arrow, they ultimately take back the city from Diaz, who goes into hiding. After the Earth-X invasion he marries Oliver and Felicity, and Barry and Iris.
In season four of The Flash, Clifford DeVoe infiltrates the A.R.G.U.S. facility holding the metahuman Neil Borman by impersonating Diggle and kills most of the security; overcharging and killing Borman to be a nuclear battery for his satellites. Afterwards, Barry brings the real Diggle to S.T.A.R. Labs to reveal the location of the facility.
In season seven, Diggle remains working at A.R.G.U.S., and continues leading his manhunt against Diaz. The combined efforts of Diggle, A.R.G.U.S. and the other members of Team Arrow (except Oliver, who is in prison) result in the successful capture of Diaz. After Oliver is released from Slabside Maximum Security Prison in exchange for Diaz, Diggle and Felicity are the first to receive him. Later, Diaz is recruited by Diggle as a member of the "Ghost Initiative", his own version of the Suicide Squad. Diggle plans to use Diaz to locate Dante, the financier behind the legendary Longbow Hunters. Diggle returns to vigilantism along with Curtis and Rene Ramirez to capture the criminal Chimera. Despite succeeding, the trio are arrested for violating the city's anti-vigilante law, but mayor Emily Pollard ultimately offers to drop the charges against them, provided they agree to be deputized and work for the police, as Oliver has. The Ghost Initiative is successful in locating Dante, but when Diaz betrays the team and helps Dante escape, Diggle hands in his resignation to A.R.G.U.S. to save his wife's job, while sending Diaz back to Slabside. Diggle later meets his late father's commanding officer Roy Stewart; Diggle's father died during an operation abroad and he blames Stewart for leaving his father behind. Stewart went on to become Diggle's stepfather and put both Diggle and Andy through rigorous training to turn them into real soldiers, resulting in a strained relationship between Diggle and Stewart. The two make amends when Diggle learns that his father died because of his own negligence and Stewart is the reason anyone survived the operation. After Team Arrow thwarts the Ninth Circle's plan to destroy Star City, Diggle takes Oliver and a pregnant Felicity to an A.R.G.U.S. safe house in the woods where the two can raise their child safe from the Circle. The season also features flashforwards that take place in 2040. These feature Diggle's adoptive son Connor Hawke and reveal that J.J. is the leader of the Deathstroke gang. Connor states that J.J. grew up hating their parents and the expectations they put on them and considers the gang his way to rebel.
In season eight, Diggle meets six-year-old Connor for the first time, but does not yet adopt him. After the adult Connor is accidentally teleported from 2040 to 2019 with Oliver's children, Diggle is shocked and devastated to learn that J.J. is psychopathic and becomes Grant Wilson's protégé and successor as Deathstroke and kills Rene's daughter Zoe in the future. Though these revelations strain their friendship, Diggle and Rene are determined to change their respective children's fates. Despite Diggle learning that his future bond with his adoptive son is what possibly would cause J.J. to take the path of evil, Diggle chooses to accept his destiny to Connor while trying to save J.J. After the events of the Crisis, during which Oliver perished, Diggle's daughter Sara is restored to existence, and he and Lyla are happy of having two children. While moving to Metropolis, Diggle is intrigued by a crashed spaceship and discovers a mysterious box that glows green. In season six of The Flash, Diggle arrives in Central City to give Barry the mask he gave Oliver the first time they met. Diggle also helps him come to terms with Oliver's death.
When on an A.R.G.U.S. assignment in Gotham City, Diggle encounters Luke Fox in a bar where he got involved in a poker game with Russell Tavaroff. When Tavaroff attacks Luke outside the bar, Diggle stops him. While comparing to how they both lost their fathers, Diggle advises Luke to take the right path as they notice the Bat-Signal giving off a Morse code. This conversation inspires Luke to become Batwing.
After almost a year, Diggle arrives in Central City to help Barry trap a Godspeed drone with an Entropy Trap. Diggle convinces Barry to go to 2049 to check on his daughter Nora, but he is knocked out of the Speed Force by Godspeed drones. Diggle, Cecile Horton, and Frost find an amnesiac August Heart, but soon make him remember his identity. Following this, Diggle vows to resolve something he has "been putting off": figuring out how to open the box.
Sometime later, James Olsen contacts Diggle to help his sister, Kelly Olsen, after Nyxlygsptlnz imploded the Ormfell Building, causing those caught in the implosion to be exposed to 5th Dimensional energies. When it is discovered that Councilwoman Jean Rankin took an experimental medicine that enabled her to use those energies at the cost of draining the victims of their energy, Diggle gives Kelly some inspirational advice when operating as the new Guardian and even mentions some wise words that he learned from Jefferson Pierce. This episode talks about racial trauma and the importance of not only listening when people ask for help, but also finding a way to support and aid them so they are not alone in their fight for safety and justice. "I know, but do you hear me? Do you see what is happening? People are gonna die. And I feel like I am yelling into a void! We're supposed to fight for everyone, together. And yet, I am looking at people suffer, people that look like me and everyone here is just too busy. Where is the outrage that people are gonna die without help? Without hope? Maybe you could spare a second for them."
After a while, Diggle assists his old friend Jada Jet into finding Joker's joy buzzer that would be used to help treat Marquis. They find it in Renee Montoya's office. Diggle later finds Luke at the grave of Lucius Fox where he asks him to help open a box in his possession.
After some time, Diggle visits Eobard Thawne, who is imprisoned in an A.R.G.U.S. supermax prison on Lian Yu. After Barry departed after asking Thawne about a Fast Track Labs worker claiming to be Eobard Thawne, Diggle appears to ask for his help on unlocking the mystery box he had found. Thawne helps him to reopen it, but Diggle declines its powers since he prefers to be with his family.
While attending Barry Allen's birthday party, John Diggle is among those who got taken over by Bloodwork's blood samples. Khione later used her powers to free Diggle so that he can help Flash and a temporarily resurrected Green Arrow. As Spartan, he helps Green Arrow, Flash, and Kid Flash in defeating Bloodwork before he can infect the Multiverse with his blood.
