This much-delayed “X-Men”-related film from Josh Boone features five teens with not-so-great powers.

How does one disavow an unruly mutant? Lock it up, says the Essex Corporation, the villain of “The New Mutants,” an “X-Men”-adjacent thriller about a detention hall for ultra-destructive kids — and 20th Century Studios, the manufacturer of this ramshackle flick, agrees. Directed in 2017 by Josh Boone (“The Fault in Our Stars”), “The New Mutants” spent three years on ice before being allowed to escape into the slowest summer season in a century.