T hough it might not deserve all the vitriol it’s received, Josh Boone’s superhero horror-drama undoubtedly squanders source material and actors. This long-delayed final instalment in Fox’s X-Men saga is set in a sinister facility where five mutants learn to harness their abilities. There are some diverting nightmare sequences, meangirl wit and romance, but this is mostly turgid and predictable. Boone and comics artist Bill Sienkiewicz provide commentary, while deleted scenes feature more nightmares.