Millie Bobby Brown and David Harbour are set to star together in a new, as-yet-untitled spy series for Netflix, marking their reunion following a rumored feud that emerged during their decade-long collaboration on the hit show "Stranger Things." Harbour will portray Matt Wolfe, a disgraced ex-FBI agent and security expert, who re-enters the field when his estranged daughter, Rebecca, played by Brown, disappears during a mission. Rebecca is also an agent with the same law enforcement agency.

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The news of their collaboration comes after reports surfaced in November 2025 of Brown filing a "harassment and bullying" complaint against Harbour prior to filming the fifth and final season of "Stranger Things." Sources claimed there were extensive accusations regarding the actor's demeanor. The two actors subsequently missed a "Stranger Things" event in New York City in December, despite having appeared together at the season five premiere just weeks earlier.

IMAGE4 The news comes months after the Daily Mail revealed that Brown had filed a 'harassment and bullying' complaint against her Stranger Things co-star before they were about to film the show's fifth and final season; they are pictured at the Stranger Things season five premiere on November 6

In "Stranger Things," Brown portrayed Eleven, a super-powered teenager, and Harbour played Jim Hopper, a police chief who became Eleven's surrogate father. Both characters were central to the show's plot over its ten-year run.

IMAGE7 The untitled new show will star Harbour as a disgraced ex-FBI agent who returns to the field when his estranged daughter, who also works for the law enforcement agency ¿ and is played by Brown - vanishes on a mission; pictured in a scene from Stranger Things season five

Harbour addressed the past tensions in a recent interview with Variety, describing it as a "simple rupture-and-repair thing." He explained that working together for a decade during Brown's formative teenage years, while playing father and daughter, could lead to disagreements, akin to family arguments. He stated that once the situation was cleared and they spoke directly, the issue was resolved.

IMAGE5 Harbour admitted to tension in an interview with Variety this month but said it was a 'simple rupture-and-repair thing'; pictured with Brown in 2018 in Hollywood

Brown shared her perspective via email, noting her significant personal growth from season one to season five of "Stranger Things" with Harbour's presence throughout. She described their relationship as becoming increasingly collaborative creatively over time, allowing them to push each other emotionally in scenes. Brown expressed gratitude for the shared experience, stating it is something she will always remember and value.

IMAGE2 Brown expressed her side, telling Variety: 'When you work with someone for that many years, we could push each other emotionally in scenes'; pictured on January 17

Netflix has expressed enthusiasm for the new project, developed by creator Jack Thorne, who also wrote Brown's "Enola Holmes" films. Jinny Howe, Netflix's head of scripted series in the US and Canada, stated that Thorne's talent for finding human stories within thrillers is unmatched and that audiences will appreciate Brown and Harbour reuniting as estranged father and daughter.

IMAGE3 The actress' husband, Jake Bongiovi, seen with her at the Enola Holmes 3 premiere on June 25, will serve as executive producer on the new Netflix show alongside his wife

Brown and Harbour will both serve as executive producers on the series, alongside Brown's husband, Jake Bongiovi. Brown is also slated to appear in "Enola Holmes 3," which is scheduled for release on Netflix on July 1.