‘Upgrade’ director Leigh Whannell talks low-budget worldbuilding

Upgrade tells the story of Grey Trace, a man in the near future who’s left quadriplegic after a car accident and mugging.
Following an interlude that sees Grey struggling with his new disability, an experimental computer chip called Stem is placed in his spinal cord, where it doesn’t just give him control of his limbs again — it turns him into something close to a superhuman, ready to track down the men who paralyzed him and murdered his wife.
The film, which comes out today in