Who is Dr Kay in ‘Stranger Things’ Season 5? What we know so far about Linda Hamilton's character

Hamilton's character is has been described as "hyper-intelligent and intimidating"
PUBLISHED NOV 18, 2025
Linda Hamilton as Dr Kay in a still from 'Stranger Things' Season 5 (Cover image credit: YouTube | Netflix)
Linda Hamilton as Dr Kay in a still from 'Stranger Things' Season 5 (Cover image credit: YouTube | Netflix)

'Terminator' star Linda Hamilton is one of the new faces in 'Stranger Things' Season 5. Over the last four seasons, the hit Netflix show has featured some iconic names — Sean Astin as Bob Newby, Cary Elwes, and Robert Englund. Now, the actress who became famous for her portrayal of Sarah Connor in the blockbuster 'Terminator' franchise makes an appearance.

In what will be the final season, Hamilton plays Dr Kay, and her character is described as a new government agent leading an investigation into the Upside Down. The new season sees Hawkins under military quarantine, with the hunt for Eleven (Millie Bobby Brown) making major headlines. Kay has been reported to be Mike's (Finn Wolfhard) adversary in the new season as she investigates the Upside Down seeping into the world.

Earlier, the show's co-creator Matt Duffer shared a bit on Hamilton's character. "She’s hyper-intelligent and intimidating," he told Empire. "And despite her smarts, she’ll also be getting stuck in on the action, too. “She’s a scientist, but if she needs to, she can get into a fight and shoot a gun,” teases Matt. Eleven, watch your back!"

His brother Ross echoed a similar take when describing Kay. "Usually when we're casting these new roles, we're working with our casting director to come up with the actor before we write the roles," Ross told Entertainment Weekly. "When Carmen Cuba, our casting director, suggested Linda, we got really excited because she's very, very different from Modine. She's equally intimidating and intelligent, but she can fight. If it comes down to it, she can shoot a gun, she can get in a fist fight, she can kick your ass."

In the same interview, "Part of the reason she's scary," Matt said, "is that she, unlike Dr. Brenner, has no emotional connection to Eleven. There was that paternal quality that Brenner had. Dr. Kay has none of those feelings. She really views her just as a weapon that needs to be acquired." Per reports, Hamilton was already a huge fan of the show, and her casting just makes it all the more fun.

The official synopsis for Season 5 reads, "Hawkins is scarred by the opening of the Rifts, and our heroes are united by a single goal: find and kill Vecna. But he has vanished — his whereabouts and plans unknown. Complicating their mission, the government has placed the town under military quarantine and intensified its hunt for Eleven, forcing her back into hiding. As the anniversary of Will’s disappearance approaches, so does a heavy, familiar dread. The final battle is looming — and with it, a darkness more powerful and more deadly than anything they’ve faced before. To end this nightmare, they’ll need everyone — the full party — standing together, one last time."

'Stranger Things' Season 5 drops on November 26 on Netflix with the finale releasing on December 31.

GET THE BIGGEST ENTERTAINMENT STORIES
STRAIGHT TO YOUR INBOX.

MORE STORIES

Initially released in the U.K. and Ireland, 'Little Disasters' will be available for streaming in the U.S. from December 11
24 minutes ago
Kevin Costner breaks years of silence on his personal faith as his raw, unfiltered Nativity retelling arrives on ABC
1 hour ago
The 'All's Fair' Season 1 finale blew the firm wide open, and now the cast teases a season 2 filled with bigger betrayals and shocking returns
1 hour ago
Based on some of hockey’s most iconic rivalries, ‘Heated Rivalry’ adds a love story that didn’t actually happen
1 hour ago
The ninth episode of 'All’s Fair' delivered one of the most shocking moments of the series with the arrest of a trusted member of the legal firm
1 hour ago
A shocking confirmation from a former Slayer, Eliza Dushku, alters everything we expected from the Buffy revival.
2 hours ago
Based on the popular 'Tomb Raider' video games, the upcoming series stars Sophie Turner as Lara Croft
4 hours ago
Omar Sy has described his character as "an extraordinary plaything" that he enjoys every time he steps into the role
4 hours ago
Carol’s fate may hinge on a chilling loophole that could let the hive convert her without ever touching her body
5 hours ago
A few cast members have confirmed their exit from the series, explaining why they won't return
14 hours ago