The Secret Meaning of Tom Cruise's Knife in Final 'Mission: Impossible' Trailer

The last mission is almost here. In the latest trailer for Mission: Impossible — The Final Reckoning, Ethan Hunt (Tom Cruise) is not only facing his biggest enemy ever, he's also reckoning with his past. At several points in the new trailer, we see flashes from the first Mission: Impossible movie in 1996, including several shots of a knife that Ethan dropped way back during a very pivotal moment. 

Here's why that knife is such a big deal in the trailer and what it might mean for the end of Ethan Hunt's journey in The Final Reckoning.