There's a man in ragged clothing kneeling and bowing. Real Trekkies know this dude already: it's Spock. He's a member of our main crew of heroes and is half-human and half-Vulcan, which is an alien species.
The planet he's on looks pretty nasty, complete with volcanoes and lava rivers. Spock is woken from his concentration by a loud noise.
He walks beside a river of lava and approaches three people in ornamental robes. They give each other the Vulcan salute, which is a hand motion used by their species to convey the message, "Live long and prosper."
A woman in a robe starts talking about ancestors and stuff. Here's what you need to know context-wise: the Vulcans were once a very violent and emotional species, but at some point in their history began actively suppressing emotions and using only logic to make decisions.
This is a Big Deal for them, so expect it to come back around.
Anyway, the lady starts talking about "Kolinahr," which is the ritual through which a Vulcan abandons his or her emotions. And it looks like Spock is about to pass the test.
To honor the ceremony, the woman goes to place a necklace on Spock, but he suddenly puts up his hand and stops her. Huh? He looks as confused as we are.
The woman asks Spock to give her "his thoughts." Here's some more context: Vulcans can do something called a "Vulcan mind meld" by placing their hands on someone's face, giving them full access to their thoughts. Useful, huh?
It seems that a "consciousness" has been calling to Spock from space. According to the woman, this consciousness is speaking directly to his human side.
Her verdict? No Kolinahr for you. The trio walks away, but the woman drops the necklace as she goes.