The strangest thing about Watchmen, really, is the fact that it's so, so faithful to the comic book on which it was based - to a fault, even - and then right at the very end, director Zack Snyder decides to divert from the source material in ways that could have only ever been controversial. So if you were fan of Watchmen, of course (and everyone who went to see this movie probably already was), it felt like something akin to a kick in the teeth. In the original graphic novel, then, it's revealed that Veidt has been experimenting with teleportation and inter dimensional stuff for a long while, and eventually manages to produce a giant squid monster. The hope, then, is that the world will unite to defeat this creature instead of destroying one another. In the movie version, though, Veidt uses this same plan, but Manhattan is poised as the "common enemy" - which didn't make much sense.
Sam Hill is an ardent cinephile and has been writing about film professionally since 2008. He harbours a particular fondness for western and sci-fi movies.