Tenet 2 might seem like an unlikely thing given that Christopher Nolan doesn't tend to do sequels, but there's something in Tenet that is stopping us ruling it out entirely.
The movie sees John David Washington's Protagonist thrown into a unique world of time inversion in order to stop a plot that will likely destroy humanity as we know it. Classic spy stuff, really.
Nolan has plenty of tricks up his sleeve as the intricate plot plays out during Tenet that encourages repeat viewings, and there's one particular revelation that has started us thinking that we could get a sequel.
But to explore it, we have to go into some major spoilers, so seriously, don't read on unless you've already seen Tenet.
During Tenet, it's revealed that Neil (Robert Pattinson) – who the Protagonist seemingly brings into the mission to save the world – has actually been involved with it long before the Protagonist has.
And what's more, Neil was actually recruited into the Tenet organisation by the Protagonist, only that happens in the Protagonist's future. It seemingly confirms that Neil has mostly been moving backwards through time, all in order to help the Protagonist save the world.
The whole mission in Tenet has been a "temporal pincer" strategy, likely set up by the Protagonist in the future, with Neil part of the team that were moving backwards.
That means Neil has known the Protagonist for a long time and at some point in the Protagonist's future, he'll come across a younger version of Neil who he recruits into the organisation, potentially because he knows he always did.
Think of their relationship as similar to the Doctor and River Song's relationship in Doctor Who. Any time they met up, both of them were at different stages in their own personal timeline.
Like River Song too, Neil doesn't give the Protagonist any spoilers: "We get up to some stuff."
It's that line which, if Nolan wants to, could be used to create a follow-up to Tenet as there's plenty about the Protagonist and Neil's relationship that we just don't know yet, or the Tenet organisation as a whole.
We know it's set up in the future and we assume it's the Protagonist who sets it up, perhaps as a response to what he knows will happen with Sator and the other people in the future, who want to use time inversion to destroy the world.
It's a rich area that Nolan could explore and flesh out, and he could do it through the Protagonist and Neil. Instead of the Protagonist being the fish out of water, you could have Neil's recruitment into Tenet that forms the basis of another story.
And who wouldn't want another movie of John David Washington and Robert Pattinson undertaking another timey-wimey spy mission?
Nolan has made no secret of how Tenet is his take on a James Bond movie, so he could even think of a sequel like how the Bond series works. It could be just another mission for the Tenet organisation with returning characters.
However, before we get too excited about a return to the mind-bending world that Nolan created in Tenet, it's worth looking at his career to date.
Aside from his Dark Knight trilogy, Nolan has never returned to a world and preferred instead to focus on original movies. Often, his movies have left unanswered mysteries to ponder – think Inception and its spinning top final shot.
So just because Tenet only really scratches the surface of the world and hints at other adventures, it doesn't mean that Nolan necessarily plans to return to the world to fill in the gaps.
Perhaps in the weeks to come when he talks more about Tenet, we'll get a sense of whether a sequel or follow-up is something he'd consider or if, like Inception and Interstellar, it's a one-and-done thing.
We'd love to see another Tenet movie, but right now, our feeling is that Nolan would prefer to keep the mystery.
Tenet is out now in UK cinemas and is released in US cinemas from September 3.
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