|“|| Allison: "Haven't you heard there's no 'I' in 'team?'"|
Jackson: "Yeah, but there is a 'me.' Ha. That was a joke. Gosh, you must really, really hate me."
Allison: "Not at all."
Jackson: "You sure? Because... I'm not a bad guy. I mean, yeah, I make stupid mistakes-- a lot-- but I'm not bad. I really like you. And Scott. I really, really like you both, and I want you to like me. I want to get to know you guys better."
Although Allison and Jackson were friendly to one another, their relationship became rocky and strained due to Jackson's dislike of Scott McCall, Allison's boyfriend at the time. Jackson later started to be nicer to Allison, although this was likely an attempt to both gain more information about Scott's new abilities as well as to sabotage her relationship with Scott to punish Scott for outshining him in lacrosse.
Despite, the two did end up on better terms with one another. After Allison broke up with Scott due to the events of Night School, she and Jackson became much closer, with obvious signs of a mutual attraction developing between the two. They ultimately went to the winter formal together as friends, and both were instrumental in the defeat of then-Alpha Werewolf Peter Hale.
In Season 2, Allison and Jackson's interactions with each other became briefly limited due to the fact that Jackson had broken up with Lydia and was still desperately pursuing lycanthropy. However, after it was revealed that Jackson was, in fact, the Kanima wreaking havoc on Beacon Hills after the Bite he received from Derek Hale, Allison, along with Scott and Stiles, devoted themselves to saving him without killing him. This plan was ultimately successful thanks, in part, to Lydia's Banshee powers, but once Jackson had been transformed into a Werewolf with Kanima traits, he moved to London with his family as a result of his public deaths and resurrection. Jackson was still in London when Allison was killed by an Oni demon several months later, preventing them from ever seeing one another again.
Allison and Jackson are known as Jallison by fans.
Throughout Teen Wolf
In Wolf Moon,
In Pack Mentality,
In Magic Bullet,
In The Tell,
In Heart Monitor,
In Night School,
In Wolf's Bane,
In Code Breaker,
In Shape Shifted,
In Ice Pick,
In Party Guessed,
In Master Plan,
In Tattoo, Allison Argent and Lydia Martin were in Lydia's car, where the two were headed to a double date Lydia had set up. After reminding Lydia that she wasn't ready to "get back out there" following her break-up with Scott McCall in Season 2's Master Plan, the conversation turned to Jackson Whittemore, a sore subject judging by Lydia's insistence that Allison not say his name.
Allison went on to ask if Jackson was okay and if everything worked out after Jackson's two deaths and subsequent resurrections, as she had spent the last four months in France visiting family with her father Chris Argent and had missed all of the events in Beacon Hills over the summer. Lydia informed her that the doctors ended up looking like idiots for declaring him dead when he was ultimately found very much alive, and that all of this attention led the Whittemore Family to move to London, England. Lydia then added that Derek Hale had taught him "Werewolf 101," including how not to kill people during full moons. However, when Allison asked Lydia if she had talked to him, Lydia replied that she hadn't heard from him since he left for London before making a joke that an "American Werewolf in London" would be an absolute disaster.
- Though it was confirmed that Jackson had romantic feelings for Allison, it is unknown if Allison returned those more-than-friendly feelings for him.
- Jackson is one of the only major characters who did not get to have an onscreen reaction to Allison's death in Season 3B's Insatiable.