The Final Reckoning" director Christopher McQuarrie breaks down his ending and that "gnarly" Tom Cruise stunt. Spoilers!

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

That’s just part of what bogs down The Final Reckoning. In fact the movie is slow out of the gate as it has to set up what has happened in the two months between the end of Dead Reckoning, the basics of the plot and a quick “best-of” clip from the franchise before things really get going.