A thrillingly doom-laden series finale, it's the most enveloping "M:I" film since "Ghost Protocol," because something's at stake.

Christopher McQuarrie directed and wrote four consecutive films in the franchise, including this weekend’s “Mission: Impossible—The Final Reckoning.”

The best of the more minor action sequences in The Final Reckoning involves Grace and William Donloe’s wife exchanging fire with Russian special forces as they try to get the coordinates for the Seva...