As the writer behind first Saw movie and the Insidious series, Whannell has proven he knows how to dish out gruesome twists and find tension in spooky places. Upgrade, a thriller about a mechanic (Marshall-Green) implanted with a chatty microchip in his brain following a tragic accident, finds the filmmaker adding a bit of John Carpenter-esque social commentary to the mix, along with a healthy dose of Terminator-style action mayhem. The revenge aspect of the story is one-note and familiar -- Death Wish and John Wick cover similar territory -- but Marshall-Green's lead performance is darkly funny and he brings a startling degree of vulnerability to the role. When the microchip takes control of his body, his limbs flail about like they're being pulled by a digital puppet-master and the movie discovers a mischievously absurd tone. The shifts between Silicon Valley satire and body horror can be jarring, but it makes sense that a project this tricky would have a few bugs built into it.