Last season, David and his former friends teamed up with Division 3 to take on the Shadow King. With the tides changing, they seem to be an impasse; their former friend rejected their help and is now beyond saving.

For Clark DeBussy, the interrogator from the government's covert group, Division 3, he now faces an opponent far more dangerous than any encountered previous: David Haller. As shared at the Legion Season 3 Red Carpet Premiere, Hamish Linklater stated, "Season 1, Clark has a great deal respect for David. Season 2, he had even more respect for David. Season 3, he's just going to kill David."

Whereas, for Bill Irwin, who plays brilliant geneticist Cary Loudermilk, shared during the set visit, "Usually an actor’s job is to view their character as good, and that’s the way I view Cary Loudermilk. Season One, my recollection of the story is 'Who is this guy David?' We have a thing we’re doing here, and it’s important so who is this guy? And then 'Wow is he powerful, I believe in him.' Then at the end of Season Two, 'Wait a minute.” So that’s where things sit as we launch into Season Three, and it’s a bit of a roller coaster for this character. 'Who do I look to? Who do I report to? Who is my leader?'"

Expanding on Cary, Irwin stated, "I’m very susceptible to my loyalty to David. So at the end of Season Two, I’m part of a courtroom where we really banish him in effect. I built the thing that trapped him. I’m not sure I totally felt comfortable with that, and certainly in Season Three, I don’t."

What about Kerry Loudermilk? There's nothing she loves more than a good fight (except maybe Cary), and there's no bigger fight than going up against David. Amber Midthunder provided us with some insight to what her character's mission is this season. "Where we left of this year, and where it picks up is just kind of chaos," exclaimed Midthunder. "It’s a very normal ebb and flow of life. You have a group, and you have something solid, and then it falls apart and you don’t know where to go or what to do and you’re broken into tiny pieces. Who is going where and who do you stick with? Kerry's mission is she’s marked by justice and victory, and that’s what I love about her. Wherever she can find justice and victory, that’s where she’s going to go."

Meanwhile, at the start of the new season, to "save" their pragmatic friend Ptonomy, Cary uploads his consciousness into Division 3's computer system, the Mainframe. His abilities, his photographic memory and the ability to read the memories of others, has been magnified tremendously, but has that come at the cost of his humanity? According to Jeremie Harris, who plays Ptonomy, we'll have to wait and see. "He has a very technical mission, a straightforward mission," said Harris. "He has to somewhat deal with his feelings and emotions, but a lot of that is tied up because he's not fully... he's this Mainframe now. His way of processing that and figuring those things out are not human."