Although initially slated for release last November, Dark Phoenix underwent relatively extensive reshoots, though exactly how much was changed isn't clear at this time. However, a new interview has revealed how the production altered the film's climax during that process.

According to Entertainment Weekly's interview with the cast, reshoots saw director Simon Kinberg shoot a new third act that moved the action from space to a military train. The outlet reports the X-Men have been kidnapped in the new climax.

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“I think the biggest challenge is modulating the film so that we have the big scale and visual-effects action that these movies require, but balancing that in a way that feels calibrated with the drama,” Kinberg said. “You have these big space sequences and trains flying through the air and people firing lightning bolts, but you also have a lot of emotional, four-page dramatic dialogue scenes.”

Fans of Chris Claremont and John Byrne's "Dark Phoenix Saga," which serves as the inspiration for the film, will notice quite quickly that this constitutes a major change to the source material, which saw the X-Men and Shi'ar Imperial Guard transported to the Blue Area of the Moon to determine the fate of Jean Grey.

Currently, Dark Phoenix is tracking for the lowest-opening and overall gross of any film in the X-Men franchise. This is in part attributed to Disney's recent acquisition of key assets from 21st Century Fox, which means the X-Men, among others, will now be in the hands of Marvel Studios.

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Directed and written by Simon Kinberg, Dark Phoenix stars James McAvoy, Michael Fassbender, Jennifer Lawrence, Nicholas Hoult, Sophie Turner, Tye Sheridan, Alexandra Shipp, Kodi Smit-McPhee, Evan Peters and Jessica Chastain. The film arrives June 7.