‘Polar’ film review: ‘Terrible is a generous word’

Mads Mikkelsen and Vanessa Hudgens in “Polar.” Credit: Jasper Savage/Netflix.

Our critics review “Polar,” a Netflix original about a top assassin; “Serenity,” about a fishing boat captain whose ex-wife pleads to him for help; “The Kid Who Would Be King,” a modern fantasy about a young boy who finds the legendary sword of Excalibur.