STEM is implanted in Grey's spine, and becomes more and more autonomous throughout the film, until a terrifying truth about the technology is finally revealed. The ending of Upgrade delivers a shocking twist with STEM, which helped 2018 movie find success on Netflix years later.

By the end of the film, Stem has been “freed” by the hacker Grey hires to take Stem off-line, and the computer uses its newfound freedom to blackmail Grey into tracking down the killers, which...

Upgrade ending (Spoilers) So at the end of Upgrade, it is revealed that Stem was the one pulling the strings all along. He was giving orders to Eron, and he ordered the hit on Greys wife and to make him paralyzed.

Summary: Set in the near-future, technology controls nearly all aspects of life. But when Grey, a self-identified technophobe, has his world turned upside down, his only hope for revenge is an experimental computer chip implant called Stem. Director: Leigh Whannell. Writers: screenplay by Leigh Whannell. Cast: Logan Marshall-Green as Grey Trace.

In the big finale of Upgrade, it turns out that STEM's main goal was to keep evolving and be a bionic being. With Grey stuck in a fake reality, STEM can keep moving...