James Cameron knows how to push emotional buttons. Titanic is, once the iceberg hits, an unabashed weepie. The lava thumbs-up at the end of Terminator 2 will have the hardest hearts melted down to scrap. And Avatar and Avatar 2 are packed with devastating moments, from the destruction of Hometree, to the death – spoiler alert! – of Jake and Neytiri’s eldest son Neteyam in the sequel. But by the sounds of it, the third Avatar movie – the upcoming Fire And Ash – might be the most emotional of the bunch, even when viewed in unfinished form.

Case in point: Cameron’s own wife, Suzy Amis Cameron, saw a version of the film from late last year, and – per her filmmaker husband – was completely overwhelmed with emotion. “My wife watched the whole thing from end to end — she had kept herself away from it and I wasn’t showing her bits and pieces as we went along.