It may not be the forgotten blockbuster that the Internet tries to claim, but James Cameron's Avatar—a multiple-Oscar-winning, $2.9 billion grossing megahit—did in fact come out more than a decade ago. And even if you remember the adventures of Jake Sully and Neytiri fondly, you may have gotten fuzzy on the details in the intervening years. What were people doing on this planet, again? How do avatars work? What's unobtanium??

Lucky for all of us, The Way of Water really doesn't rely that much on knowledge of the first movie. This reporter overheard a woman outside the theater telling her friend how much she liked the new one, and how now maybe she'll go back and watch the first. The best way to catch up is to watch the original again, now streaming on Disney+.  But if you need a quicker crib sheet before seeing The Way of Water this weekend, below is the bare minimum of what you actually need to know.

Where are we?

More than 100 years from now, humans have traveled to a distant moon called Pandora, which is not unlike earth— forests, oceans, etc.—but also has air that becomes toxic for humans after about 10 seconds, which means humans have to wear oxygen masks to walk around.

Who are the blue people?

The Na'vi are the native species of Pandora, with their own language (yes, a real language!) and customs cribbed loosely from a handful of actual human cultures. And like many cultures throughout history, they're not thrilled when the interloper humans arrive on Pandora, and especially when they start mining for a precious resource dubbed unobtanium.

Do I need to remember what unobtanium is?

You really don't, I promise.

OK what about the humans from the first movie?

So the humans on Pandora are basically divided into two groups: the ruthless military and business types, led by Giovanni Ribisi's weaselly tycoon Selfridge and then Stephen Lang's Colonel Quaritch, and the scientists led by Grace Augustine (Sigourney Weaver). Our hero Jake Sully (Sam Worthington) works for both of them— he's recruited to work with Grace and her researchers, but as a former Marine he's easily convinced by Quaritch to work as a double agent, for a while at least.

There are a few other humans from the first movie who reappear in The Way of Water, notably Joel David Moore and Dileep Rao as friendly scientist types, but don't worry too much about them.

So what's an avatar?

Actually not a significant part of the new movie, but for the sake of it: Avatars are Na'vi-human hybrid bodies that humans can occupy via neural link. In the original Avatar, Jake and the rest of the science team lie down in tanning-bed-type boxes to connect with their avatar bodies, which move freely around Pandora. But after Jake embeds himself with a Na'vi tribe, falls in love with the chief's daughter Neytiri (Zoe Saldana), and eventually leads a rebellion against the humans, he ditches his human body at the end of the film to live full-time as his Na'vi self. You'll see humans connect with Na'vi bodies a few times in The Way of Water, but for the most part nobody jumps back and forth this time.

What else happens in the original Avatar?

Well, some pretty good action sequences still worth watching! But plot-wise the thing to know is that Jake and Neytiri fall in love, Neytiri kills Quaritch at the end of the final battle, and in the end the humans are forced off Pandora. Oh, and Grace Augustine dies, but her avatar body is still around. Just... keep that in the back of your mind.

Anything else?

Honestly, not really. The visual dazzle of Avatar will come right back to you at the start of The Way of Water, and there's significant effort put into recapping the events of the first movie at the beginning because 13 years is a long time. The Way of Water also introduces entirely new environments and cultures on Pandora, so after the first hour, almost everything familiar from the first film is left behind in favor of something brand new—no research required.