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Allyson Nelson, played by Andi Matichak, is a fictional character who first appeared in the 2018 film Halloween. She went on to appear in the sequels Halloween Kills and Halloween Ends and all of their corresponding novelizations.
In Halloween, Allyson attempts to have a relationship with her grandmother, Laurie Strode, but her efforts are undermined by her mother Karen. When Laurie shows up unannounced to Alysson's celebration dinner, it puts even more strain on their relationship.
Later that night, Allyson finds her boyfriend, Cameron Elam, cheating on her at a costume party and leaves with his friend Oscar Berlucchi. Meanwhile, while babysitting a boy named Julian, Allyson's best friend Vicky and her boyfriend Dave are killed by Michael Myers. Deputy Frank Hawkins and Laurie overhear the incident on the radio and go over to the house. Laurie sees Michael for the first time in 40 years, and shoots him in the shoulder before he flees. The police take Laurie, Karen, and Allyson's father Ray to Laurie's home for protection and a squad car remains outside the residence. Deputy Hawkins promises to find Allyson and bring her to be with the family.
Dr. Ranbir Sartain, Michael's psychiatrist and former student of Dr. Sam Loomis, persuades Sheriff Barker to help in the hunt for Michael. Meanwhile, as Allyson and Oscar walk home from the party, Michael kills Oscar, but Hawkins and Sartain arrive just in time to rescue Allyson. Deputy Hawkins then tries to kill Michael, but Dr. Sartain – who has become obsessed with Michael's enigmatic motivations – attacks and leaves Hawkins for dead. It is revealed that he orchestrated Michael's escape to study him "in the wild." Dr. Sartain then heads towards Laurie's home with an unconscious Michael and Allyson locked in the backseat together. Michael wakes up and kills Sartain while Allyson flees from the scene.
Allyson makes it to Laurie's house after Michael has already arrived. She gets there just in time to help trap Michael inside the safe room with Laurie and Karen's help. The trio sets the house ablaze, and Laurie says goodbye to Michael before she begins to faint and lets her daughter and granddaughter quickly hitchhike a passerby vehicle to take her to the hospital. A final shot of the burning basement is shown, with Michael nowhere in sight. In a post-credits scene, Michael's breathing is heard, indicating that he has survived.
In Halloween Kills, Allyson and Karen sit with Laurie in the hospital. Cameron eventually shows up after he calls for assistance after finding Frank Hawkins. Allyson and Cameron join Cameron's father Lonnie in hunting for Michael Myers. The tree of them patrol the town while Allyson hears stories about her father when he was younger.
Lonnie figures out that Michael was merely making his way home after tracking his path of murders on a map of Haddonfield. After arriving at the Myers House Lonnie demands that Allyson and Karen stay in the car, realizing he should never have brought them along in the first place. Within seconds of entering the house, they hear a gunshot and run in to help. They find him dead, stuffed in the attic door.
As they find the homeowners, Big John and Little John dead, Michael appears and attacks Cameron. Allyson falls down the stairs and breaks her leg. As Michael stalks her, Karen attacks him and lures him to a mob where he is brutally beaten. An ambulance hauls Allyson away as Michael kills the entire mob and returns to his old home to kill Karen.