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Betrayal is a recurring theme in The Walking Dead. It occurs when a character or group turns on another person or party with whom they were previously allied with.
Dexter and Andrew, accompanied by Patricia, turn on the group after Dexter is unjustly locked up due to two murders. The group assumes that he is guilty due to his past. (Issue 18)
Otis snaps at Patricia and gets on to her for betraying the group and joining the prisoners. (Issue 19)
Gregory offers Maggie a poisoned drink in an attempt to kill her. (Issue 137)
Brandon Rose frees Negan and attempts to warn the Whisperers about Rick's declaration of war towards them, so that both sides can be killed, in vengeance for his mother's and father's deaths. (Issue 153)
Negan betrays Brandon by stabbing him in the chest. (Issue 153)
Regardless of whether or not the player sides with him, Larry tries to leave Lee Everett to die in order to "protect the group" because of Lee's past as a murderer. (A New Day)
Ben Paul fearfully betrays the motor inn survivors by giving the bandits supplies, firstly, in order to save his friend, a supposed hostage of the bandits, and later in fear of Lilly's reaction.(Long Road Ahead)
Out of rage and lack of sleep, Lilly shoots Carley for calling her out and defending Ben or will accidentally shoot Doug whilst trying to kill Ben for stealing the supplies. (Long Road Ahead)
Even if the player always sides with Lilly and trusts her with Lee's secret and lets her back into the RV after she shoots Carley/Doug, she will still selfishly reveal Lee's secret after killing Carley/Doug. (Long Road Ahead)
If the player doesn't abandon Lilly, she will steal the RV when she is alone inside of it, even if the player agrees to go with her. (Long Road Ahead)
Vernon betrays Lee's group by stealing their boat in Savannah, and, depending on the player's decisions, he could lock someone in the group in the shed with a shovel. (No Time Left)
Vince is forced to shoot one of his fellow prisoner's legs off in order to escape with the other. (Vince's Story)
Nate will deliberately stop his car just to get Russell to be attacked by a walker in response to Russell not answering one of Nate's petty questions. (Russell's Story)
Russell has the option to draw the pistol on Nate when the latter gives him his pistol to cover him. (Russell's Story)
Stephanie tries to make off with most of the Pitstop survivors' medicine and ammo. (Shel's Story)
Shel can decide to steal the camper and betray Roman and the rest of the group. (Shel's Story)
Jane betrays Troy by lying to him, telling him he can come with the escaping group of survivors, then shooting him in the crotch, and leaving him to be devoured by walkers. In Harm's Way)
Mike, Bonnie (Determinant), and Arvo attempt to steal the groups truck and all of their supplies before shooting Clementine. (No Going Back)
Randy, Patricia, and Gill can betray Clem, AJ and Jane if Clem killed Kenny, went with Jane, and let the family in by stealing their supplies. (No Going Back)
David García becomes more hostile, leading him to kill Clint if they take the deal, break Fern’s arm then attempting to kill her, and killing Rufus if spared which causes the group to fear and question him. He later tries to kill his brother then takes Gabe away which can determinately lead to Gabe's death. (From The Gallows)
Marlon betrays the group by killing Brody and falsely accusing Clementine of it. (Done Running)
Nick Parsons shoots his former friend Philip in the back. (Rise of the Governor)
Brian kills Nick after he fatally wounds Phillip and accidentally kills a teenage girl, whom Philip was about to rape or feed to Penny. (Rise of the Governor)
Edwin Jenner traps the group in the CDC and tells them that the building is set to blow, believing that it would be the least painful way to leave this new world. (TS-19)
Father Gabriel Stokes betrays Rick's group by warning Deanna Monroe that she made a mistake letting them into Alexandria and that they will put their own lives first and destroy everything the Alexandria residents have created. (Spend)
Spencer betrays Rick by asking Negan to kill Rick so Spencer can take leadership afterwards. Instead, Negan kills Spencer, unimpressed with his coward-like ways. (Hearts Still Beating)
Tara Chambler betrays the trust of Cyndie and the Oceanside community by exposing their existence to Rick Grimes in order to take their weapons. (Something They Need)
Simon betrays Negan after questioning his leadership by defying his orders in exterminating the Scavengers, leaving Negan to die after being ambushed by Rick, ordering the extermination of the Hilltop and plotting to overthrow him once his leader returns. (The Lost and the Plunderers, The Key)
Rick and Morgan betray a group of Saviors who escaped from the Hilltop by killing them during a herd attack after promising them safety. (Still Gotta Mean Something)
Dwight betrays Simon, Gary and a few other Saviors by telling Negan about the coup. (Worth)
Eugene betrays Negan and the Saviors by tampering with the ammunition he produced, ultimately causing Negan's downfall and Rick's victory over the Saviors. (Wrath)
Dante betrays Siddiq by killing him, revealing Dante to be a mole for the Whisperers. (Open Your Eyes)
Mary betrays Alpha and the Whisperers and goes to Alexandria and joins their side to defeat them and inform about the group trapped in the cave. (Stalker)
Leah betrays and kills Pope after realizing that he cares more about winning than their family. She then betrays Daryl, claiming to the other Reapers that Daryl had killed Pope. (For Blood)
Ofelia Salazar betrays Andrew Adams by capturing him using his affection for her so that he can be traded for her mother and Nick. Her father then reveals that he actually intends to torture Andrew for information and lied to protect his daughter. (Cobalt)
Reed attempts to kill The Abigail's crew after Connor agrees to drop them on shore. However, the attempt is foiled by the return of Nick with Luis Flores. (Blood in the Streets)
Jack Kipling reveals that contrary to his brother's wishes, Reed kills all of the crews of the ships that they pillage without Connor ever knowing about it. (Captive)
Chris feels betrayed that Madison lied about believing his story about why he killed Reed. (Sicut Cervus)
Chris betrays Madison by purposefully not helping her against a walker, something that Alicia Clark witnesses. He later threatens Alicia to keep quiet, but she betrays his secret to Madison. He then apparently tries to kill the two women at night before Strand shooting Thomas Abigail wakes them up. (Sicut Cervus)
When scouts start abandoning La Colonia due to the danger the community is facing, Alejandro feels betrayed, particularly by Francisco fleeing with his family. (Pillar of Salt)
After capturing Francisco and not getting the promised Oxy delivery, Marco believes that he has been betrayed, particularly by Nick. (Pillar of Salt)
In order to get taken back to the Rosarito Beach Hotel, Strand lies to Daniel and claims that his daughter is there. It is only once they are there and find it overrun that Strand admits that Ofelia had left shortly after Madison's group arrived. Angered by this betrayal, Daniel takes off and leaves Strand behind. (Burning in Water, Drowning in Flame) Daniel subsequently holds a grudge against Strand for years, feeling that this kept him from finding his daughter until it was too late. (Skidmark)
Ofelia betrays her friends by poisoning the Broke Jaw Ranch community with anthrax. However, she was unaware of what exactly she was using and was left horrified that it was anthrax. (The Unveiling-Children of Wrath)
Following the discovery that June is still alive and with the Vultures, Alicia, Strand and Luciana believe she betrayed them and seek revenge until Morgan talks them down. June later explains the truth which reveals that she did not betray them after all. (Just in Case-No One's Gone)
After being captured by Sarah and Wendell, Morgan gives them false directions to Alexandria in exchange for their help in getting out of trouble. Once they get the information they need, the two and Jim Brauer promptly abandon him to die. (The Code)
After Al falsely claims that her SWAT van has medicine so that June will retrieve it, June feels betrayed, particularly as she had nearly killed Quinn over apparently nothing. (Weak)
In order to get Morgan's Group away from Wittington's Denim Company, Logan tricks them into going as far away as possible by pretending to be someone that needs their help. Only once they are gone and he has control of the factory does he reveal his betrayal. (Here to Help)
Derek betrays his brother and his friends after discovering that they are connected to Morgan Jones. (The Holding)
Dakota betrays Alicia and joins forces with Teddy and his Doomsday Cult after being convinced by Teddy to not change who she is. (Mother)
Strand betrays Morgan and leaves him to a herd of undead sailors so that he can be the hero in the fight against the cult. However, Morgan survives and returns to help Strand against Dakota, Teddy and Riley. (USS Pennsylvania)
Daniel Salazar realizes that Rollie has betrayed them to the cult and executes Rollie on the spot for his crimes. Riley confirms Rollie's duplicity, stating that Rollie had lost faith in them. (The Beginning)
John Dorie Sr. reveals to Dakota that Teddy is only keeping her alive as he needs a second person to turn the sub's launch keys and that Teddy intends to kill her once he no longer needs Dakota. After realizing that John is right, Dakota kills Teddy in revenge for his planned betrayal of her. (The Beginning)
Morgan betrays and tries to poison Strand to death, but fails. (The Portrait)
Arno tries to get Wes to betray his friends, bringing up how Wes had betrayed his brother Derek, but Wes refuses to do so even under threat of death. (Ofelia)
Wes later betrays Morgan's group and defects to Strand's Tower after seeing Luciana lying to Daniel about Ofelia being alive. (Ofelia) He later betrays Strand and attempts to seize control of Strand's Tower for himself, leading to Wes' death. (Divine Providence)
The player can betray his or her teammate by letting him or her get devoured to escape the herd on the highway camp. (Social Game)
The hero and the group betray Harlan and his gang after putting up with unfair rations, missions for their benefits and after they learn that Harlan plans on attacking Mauricio's family. (Social Game)
Harlan, after being wounded and persuading many members of the group that he killed Nathan to survive and to no ill reason and that his group is the new way of life, attempts to kill the hero and Sky after finding out the map they were given to the Living's camp led to an ambush of walkers, released by Harlan. (Social Game)