Watch: Everything you need to know about Doctor Who's Ice Warriors

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It's been almost 50 years since Patrick Troughton's Second Doctor came upon some mysterious aliens frozen in a glacier. They turned out to be Ice Warriors from a supposed long-dead civilization on Mars. They seem like killers, warriors intent on their own survival and not much else.

Also: They hiss. A lot. Just a lot of hissing, really.

But looks can be deceiving, and it turns out there's a lot more to the Ice Warriors than first met the eye in 1967. Through meeting with the Third Doctor (and the Eleventh) on Doctor Who, the show proper, we got to see a much more complex race of aliens. And taking into account books, comics and audio dramas, they are even more fleshed out still.

This week, Peter Capaldi's Doctor will face off against them as humanity begins to invade Mars. Who is hero and who is villain this time? And more importantly, what do you need to know if you're going to survive in an epic struggle with the Ice Warriors?

What's that? Someone made a video with everything you need to know about Ice Warriors? And it stars me?! Well, that's handy. Push the button, Frank!