Mission: Impossible – The Final Reckoning has a Mission: Impossible 3 callback and the early theories say it's everything from a "red herring" to a de-aged Tom Cruise scene

Tom Cruise as Ethan Hunt in Mission: Impossible - The Final Reckoning.

Mission: Impossible – The Final Reckoning has an unlikely Mission: Impossible 3 callback, one that could have far-reaching ramifications as we inch towards the end of the action franchise.

You may have been too dazzled by Tom Cruise's showreel of stunts in the first trailer for The Final Reckoning to notice, at the 1:35 mark, Ethan Hunt picks up a container marked 'Biohazard'.