Kong: Skull Islandruns a healthy 120 minutes, which means you'll probably be tempted to get up and stretch your legs or hit the bathroom the moment the end credits start to roll. But if you can sit tight just a few moments longer, you'll be treated to a juicy post-credits scene with big implications for the future of the franchise.

And if you can't? Don't worry -- we've got you covered. We can tell you exactly what happens in the Kong: Skull Islandpost-credits scene, and what it all means.

(Note: from this point on, there will be spoilers for the ending Kong: Skull Island. If you haven't seen the movie yet, don't say we didn't warn you.)

SEE ALSO:'Kong: Skull Island' review: The monster becomes a hero

After the final credits roll on Kong: Skull Island, we're left staring at a black screen. Then we hear Conrad (Tom Hiddleston): "Why are you sitting there in the dark? Is this fun for you?"

But it's not actually us he's talking to. Rather, we see that he and Weaver (Brie Larson) are waiting inside a Monarch interrogation room and that he's addressing whoever's on the other side of the two-way mirror. His question are met with silence, even as both he and Weaver promise never to tell anyone else about their experiences on Skull Island.

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(Monarch, of course, is the fringe science organization that launched the expedition to Skull Island in the first place, and the same organization investigating Godzilla and the MUTOs in 2014's Godzilla.)

Eventually, Houston (Corey Hawkins) and San (Jing Tian) walk in to set up some Godzillasequels -- wait, sorry, we meant to say that they explain what Monarch's been up to. They reveal to Conrad and Weaver that there are others like Kong out there, and present them with a whole slideshow that includes ancient cave paintings of some other beasts.

All the characters in the room seem to be in awe of these mysterious creatures but fans of the classic Toho movies will likely recognize them right away. We see drawings of Mothra (basically a giant moth), Rodan (a big pterosaur), and King Ghidorah (a three-headed dragon-like thing). Intriguingly, one image appears to show Godzilla locked in a battle with King Ghidorah.

So, what does it all mean? Back in 2014, Godzilladirector Gareth Edwards announced that Mothra, Roadan and King Ghidorah would appear in Godzilla 2. While he's since stepped down from the director's chair for that project (he's been replaced by Krampus' Michael Dougherty), the Kongtease confirms those plans are still very much in play.

Legendary has already made it clear that Godzillaand Kong: Skull Islandare just the first two pieces in what they're hoping will be an entire cinematic universe of mythical monsters. Godzilla: King of the Monstersis already scheduled for 2019, with Godzilla vs. Kongfollowing in 2020. In short, that post-credits stinger is a promise that Godzilla and Kong are about to meet some intimidating new foes -- or perhaps, if they're lucky, make some powerful new friends.

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