Humankind’s collision with otherworldly life forms can make for unforgettable cinema.

This article will highlight the best of live-action human vs. alien films. The creatures may be from other planets or may be non-demonic entities from other dimensions.

Excluded from consideration were giant monster films as the diakaiju genre would make a great subject for separate articles.

Readers looking for “friendly alien” films such as The Day the Earth Stood Still (1951), It Came from Outer Space (1953) and the comically overrated Close Encounters of the Third Kind (1977) are advised to keep watching the skies because they won’t find them here.

Film writing being the game of knowledge filtered through personal taste that it is, some readers’ subgenre favorites might not have made the list such as War of the Worlds (1953) and 20 Million Miles to Earth (1957).

Now let’s take a chronological look at the cinema’s best battles between Us and Them.