The New Mutants (2020)
Nowadays a teaser poster will often come out just a few months before a film debuts. Occasionally it might even come out a year or so in advance if it is a big enough deal. But this poster initially debuted all the way back in December of 2017. That's one heck of a long tease. But despite the fact that this teaser was eventually pulled when the release date was changed, it is still a very effective design that immediately grabs your attention. The characters appear to be coming through the poster, trying to escape from whatever captivity they are trapped in. A great way of introducing us to the plight of these new mutants while only giving us the slightest glimpse of who they are.
Want to buy the poster? Try these links: