Terminator Genisys (2015)

Genisys is the boldest structural swing the franchise ever took: rather than simply continuing the story, it rewrites the original 1984 film's opening minutes on-screen, revealing that an older T-800 has been protecting a young Sarah Connor since childhood, long before Kyle Reese ever arrives. It's a clever hook — Emilia Clarke's Sarah is already a competent, gun-toting survivor rather than a waitress caught off guard — and the film's best scenes lean into the vertigo of characters realizing their own history has already been changed by someone else.

The emotional center is, unexpectedly, Schwarzenegger himself. Playing a Terminator that has visibly aged alongside its human charge — "old, not obsolete" is the film's best line — gives the star his most textured performance in the role since 1991, a machine who has spent decades learning to fake a smile because it makes Sarah feel less alone. The chemistry between Clarke, Jai Courtney's Reese and an AI-aged Arnold carries scenes the plot mechanics alone couldn't.

Where the film stumbles is in its plot mechanics: multiple competing timelines, a new adult John Connor twist that recasts the resistance leader himself as the film's villain, and a rushed final act trying to resolve all of it inside a nuclear facility leave Genisys feeling more clever than coherent. It was intended to launch a new trilogy under a "Terminator Genisys" banner; poor reception meant that plan — like so many timelines in this saga — was quietly erased.