We cut to a cave in the middle of the frozen wasteland. There are several picked-clean skeletons littered around the floor and—oh hey—there's Luke hanging by his feet from the roof. We found him, guys!
Luke slowly returns to consciousness and sees the Space Yeti (they're actually called wampas) making a tasty meal out of his Tauntaun.
Luke tries to struggle free but his feet are frozen solid. His lightsaber (read: laser sword) is conveniently sitting on the ground nearby, but it's just out of reach.
He tries again, but no luck. Then, he closes his eyes, makes a weird pose, and starts reaching for it again. Oddly, it starts to shake…
Unfortunately, the Wampa has noticed and is coming over. At the last second, the lightsaber flies into Luke's hands, and he uses it to free himself and helpfully remove one of the wampa's arms from its body.
Luke runs out of the cave but is still in trouble—it's mad windy and snowy. Meanwhile, Han is out in the same freezing weather, continuing his search.
Back at the home base, C-3PO and R2 are standing by the open hangar door, discussing Han and Luke's chances. Based on C-3PO's reaction, R2 is being quite pessimistic.
We return to the wasteland just in time to see Luke collapse into the snow. This isn't looking good, folks. He tries to keep moving, but ends up falling flat on his face.
At Rebel HQ, two soldiers are discussing the situation when they notice Leia creeping behind them and suddenly shut up. Man—things must be getting pretty hairy.
That's when C-3PO approaches, which apparently gives the two soldiers enough courage to talk to Leia directly. They tell her that they have no choice but to close the gate and put up the shield.
Leia nods sadly. C-3PO, apparently having no sense of decorum, decides that this is the proper moment to inform her that her boys have a 725-to-1 chance of surviving. Chewie, meanwhile, is banging his head against the ship and wailing loudly.
We return to the icy wasteland and see Luke still lying face down. Guess he's taking a nap? As he lies there unconscious, a distant voice starts saying his name.
It's…. some old dude, in ghostly transparent form. This is Obi-Wan Kenobi, also known as Ben, who served as Luke's mentor in the first film but was killed by the evil Darth Vader.
Ghosty-Wan Kenobi tells Luke to go to the Dagobah system, where he will learn from his former mentor, the Jedi master Yoda. The Jedi, BTW, are a mystical force of warriors who wield the aforementioned lightsabers and have telekinetic powers through something called the Force.
Suddenly, the ghostly presence disappears and is replaced by... Han. (!) Luke collapses before Han can reach him and then, as if on cue, Han's Tauntaun falls over and dies.
This is bad, but Han seems to have a plan. Luke, on the other hand, is still rambling about Ben and Dagobah.
Oh, that's gross—Han uses Luke's lightsaber to cut a hole in the Tauntaun's belly, presumably so he can use its body warmth to keep Luke alive while he builds a shelter.