Stranger Things actor David Harbour has unexpectedly departed the upcoming Searchlight Pictures film 'Behemoth!' several months after cameras started rolling. The star, famed for playing Chief Jim Hopper, has been replaced by Will Arnett, who now joins a cast including Pedro Pascal, Olivia Wilde, and Matthew Lillard.
Production Shake-Up Amid Busy Schedule
Production for 'Behemoth!' commenced in October 2025. According to industry sources speaking to Deadline, Harbour's exit is not expected to cause major disruption, as the actor had filmed only a minimal number of scenes. This was largely due to his commitments to the global press tour for the fifth and final season of Netflix's 'Stranger Things', which aired in parts from late 2025 into January 2026.
The plot details of 'Behemoth!' have been closely guarded, though it is believed to centre on a cellist. The specific character Harbour was set to portray has not been disclosed.
Personal and Professional Crossroads
Harbour's departure from the project coincides with a period of significant personal and professional focus. The finale of 'Stranger Things', a show that defined his career for nearly a decade, was released on 1 January 2026. Harbour dedicated the latter part of 2025 to promoting the show's conclusion, including events for 'Stranger Things Day' and premieres around the world.
Concurrently, the actor faced public scrutiny following the release of his ex-wife Lily Allen's album 'West End Girl' in late 2025. The album's lyrics hinted at marital strife and infidelity during their four-year marriage. While Allen stated the work was partially "based on truth," Harbour has not publicly commented on the allegations. Notably, he did not attend the London premiere of 'Stranger Things' in November 2025.
Looking Forward: The New Cast Line-Up
With Will Arnett now stepping into the role, production on 'Behemoth!' is set to continue with minimal reshooting required. The film's ensemble remains a major draw, featuring the star power of Pedro Pascal and Olivia Wilde, alongside Eva Victor and Matthew Lillard.
Representatives for David Harbour were contacted for comment regarding his exit from the film but have not yet provided a statement. The industry will be watching closely to see what project the actor takes on next following the monumental conclusion of the 'Stranger Things' era.
