Ninjas are everywhere, you just can’t see them. They’re hidden, silently observing you and waiting for the perfect time to strike. In fact, studies have shown that there are more than a dozen ninjas, on average, in the room with you right now. Since there’s no escape, you might as well put on a ninja movie to pass the time. And we’ve got the perfect guide for you: a timeline of American Ninja movies from The Octagon through The Lego Ninjago Movie! Note that we went with a rather broad, pop culture definition of ninjas, and stuck to films that featured Americans as main ninja characters or were American-produced with significant plot points involving ninjas. With that qualification out of the way, let’s break out our guide to American Ninja movies!