Editing Companion (section)

==Production==
In February 2023, it was reported that the film was in the works from [[New Line Cinema]] with a script from Drew Hancock, who was also directing, and with Zach Cregger, Raphael Margules, J. D. Lifshitz and Roy Lee producing.<ref>{{Cite web|url=https://bloody-disgusting.com/movie/3749524/companion-zach-cregger-producing-mysterious-horror-movie-for-new-line/|title='Companion' – Zach Cregger Producing Mysterious Horror Movie for New Line|website=[[Bloody Disgusting]]|first=John|last=Squires|date=February 1, 2023|access-date=May 15, 2024|archive-date=May 15, 2024|archive-url=https://web.archive.org/web/20240515033923/https://bloody-disgusting.com/movie/3749524/companion-zach-cregger-producing-mysterious-horror-movie-for-new-line/|url-status=live}}</ref>

In May 2023, it was announced that Jack Quaid had joined the film's cast.<ref>{{Cite web|url=https://bloody-disgusting.com/movie/3763602/companion-jack-quaid-starring-in-mysterious-sci-fi-horror-movie-from-barbarian-team/|title='Companion' – Jack Quaid Starring in Mysterious Sci-fi Horror Movie from 'Barbarian' Team|website=Bloody Disgusting|first=John|last=Squires|date=May 25, 2023|access-date=May 15, 2024|archive-date=May 15, 2024|archive-url=https://web.archive.org/web/20240515034941/https://bloody-disgusting.com/movie/3763602/companion-jack-quaid-starring-in-mysterious-sci-fi-horror-movie-from-barbarian-team/|url-status=live}}</ref> The following month, it was announced that Harvey Guillén, Lukas Gage, Megan Suri, Sophie Thatcher and Rupert Friend had been added to the film's cast.<ref>{{Cite web|url=https://bloody-disgusting.com/movie/3764730/companion-harvey-guillen-and-more-join-sci-fi-horror-movie-from-barbarian-team/|title='Companion' – Harvey Guillén and More Join Sci-fi Horror Movie from 'Barbarian' Team|website=Bloody Disgusting|first=John|last=Squires|date=June 5, 2023|access-date=May 15, 2024|archive-date=May 15, 2024|archive-url=https://web.archive.org/web/20240515035205/https://bloody-disgusting.com/movie/3764730/companion-harvey-guillen-and-more-join-sci-fi-horror-movie-from-barbarian-team/|url-status=live}}</ref>