Alright people, buckle up. The first trailer for Christopher Nolan's Tenet has been released. 

Tenet trailer
Source: Slash Film

While we had heard so much about the film, this is the first time we got to know anything about its plot. 

Tenet Trailer
Source: People

While we still do not know anything concrete about the plot, the trailer shows that the film has something to do with time travel and stopping World War III.

Source: Slash Film

You can watch the trailer here. 

Now the trailer might have released, but Warner Bros. is planning on releasing a longer version of it, to be played before Star Wars: The Rise of Skywalker in the theatres.