Whether you're a seasoned Directioner, just the casual One Direction fan, or looking to jump in to all the 1D mania, there's a little something for everyone in our One Direction crash course video.

With One Direction: This Is Us opening in theaters on August 30, you might want to get acquainted with the boys...or brush up on your 1D trivia a bit.

For the uninitiated, we'll walk you through how the most famous boy band in the world got their start.

We'll also give you an overview of what the 1D guys are all about--find out more about Harry Styles, Zayn Malik, Niall Horan, Louis Tomlinson and Liam Payne.

For example, who is a semi-pro footballer? Which guy doesn't have any tattoos yet?

(Shhh...hardcore Directioners, don't give the answers away!)

And for those that know even the most obscure facts about the guys, maybe you'll learn something new--or just enjoy the huge collection of pics.

There's something for everyone!

Also, pass it on...if you know someone who could use an introduction to One Direction before This Is Us lands in theaters, hook them up!

Who's your favorite 1D guy?

Gallery | One Direction: 'This Is Us' World Premiere!
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