MR. WEASLEY: We've got to get out of here. Now! […] Get back to the Portkey, everybody, and stick together!
It doesn't take long for danger/the forces of eeeeeevil to make an appearance. The kids have been attending the Quidditch World Cup, and it's been fun…but now some followers of Voldemort called "Death Eaters" have decided to make an appearance. The non-Death Eater types find it pretty scary, so they flee.
HERMIONE: It's the Dark Mark, Harry. It's his mark.
HARRY: Voldemort? Those people tonight, in the masks, they're his too, aren't they? His followers?
MR. WEASLEY [nodding]: Death Eaters.
After the march of the Death Eaters, one rogue dude sends up something called the "Dark Mark" into the sky. Kind of like a firework, but evil and scary looking (it's a skull with a snake coming out of its mouth).
RON: Brilliant, isn't he? Completely demented, of course, and terrifying to be in the same room with, but he's really been there, you know? He's looked evil in the eye.
HERMIONE: There's a reason those curses are unforgivable. To perform them in a classroom. I mean, did you see Neville's face?
Ron and Hermione are debating the merits of a lesson they just got from Mad-Eye Moody. Moody is known for having caught/brought to justice tons of Death Eaters. So, he's with the good guys, right? Well, probably, but he showed off unforgiveable curses in class. That doesn't really seem like "good guy" behavior.
MOODY/CROUCH: Only an exceptionally powerful Confundus Charm could've hoodwinked it. Magic way beyond the talents of a fourth year.
KARKAROFF: You seem to have given this a fair bit of thought, Mad-Eye.
MOODY/CROUCH: It was once my job to think as dark wizards do, Karkaroff. Perhaps you remember.
Snap. Moody and Karkaroff used to be on different sides of the good vs. evil equation, and this is a definite dig at Karkaroff's Death Eatery past. Of course, what no one except "Moody" knows is that "Moody" is actually Barty Crouch Jr. in disguise, and he's actually the evil one still doing Voldemort's bidding.
MCGONAGALL: This can't go on, Albus. First the Dark Mark, now this?
DUMBLEDORE: What do you suggest, Minerva?
MCGONAGALL: Put an end to it. Don't let Potter compete.
McGonagall definitely seems to think there's something sinister about Harry's name being in the Goblet of Fire, and she links it to the appearance of the Dark Mark at the Quidditch World Cup. Hmm, we're trying to hope for the best, but…it's kind of hard.
SIRIUS: Look, Harry, the Death Eaters at the World Cup, your name rising from that goblet…these are not just coincidences. Hogwarts isn't safe anymore.
HARRY: What are you saying?
SIRIUS: I'm saying the devils are inside the walls. Igor Karkaroff? He was a Death Eater. And no one—no one—stops being a Death Eater.
Well, if Harry was looking for comfort from his godfather Sirius…he didn't get it. Apparently, the headmaster from Durmstrang used to be a big Voldy fan, and Sirius thinks that Harry's name being in the cup = someone seriously has it in for Harry. Scary stuff.
DUMBLEDORE: As the council is very much aware, I've given evidence on this matter. Severus Snape was indeed a Death Eater and, prior to Lord Voldemort's downfall, turned spy for us at great personal risk.
KARKAROFF: It's a lie!
DUMBLEDORE: Today he's no more a Death Eater than I am.
KARKAROFF: Severus Snape remains faithful to the Dark Lord!
Pay attention, Shmoopers, because this is actually going to be important as we move into the next films. Is Snape reformed? Or is he still faithful to Voldemort? This question is going to be huge later on—you heard it here first.
LUCIUS MALFOY: I assure you, my Lord, I have never renounced the old ways. The face I have been obliged to present each day since your absence—that is my true mask.
Hmm, yet another person whose loyalties are a little…blurry, shall we say? Not that Lucius has really been that good at keeping his leanings toward Voldemort on the down low. He's a total snot to the Weasleys and Harry at the tournament, since he thinks he's above everyone—totally a Voldemort-esque 'tude, if you ask us. But he's not bad or obvious enough to be arrested (guess that's the "mask" he mentions), so it seems he's kind of doing a good job with the whole secrecy thing?
VOLDEMORT: Shall I reveal what really happened that night, thirteen years ago? Shall I divulge how I truly lost my powers? It was love. You see, when dear, sweet Lily Potter gave her life for her only son, she provided the ultimate protection. I could not touch him. It was old magic. Something I should have foreseen.
Wait, you mean love really can conquer evil? The Beatles were right? All you need is love? That's pretty good news, if you ask us. Of course, Voldemort thinks he's found a way around Lily Potter's loving protection by taking his blood. He does seem to have an easier time getting close to/touching Harry with his new-and-"improved" body…we'll just have to see if that translates into him being able to kill Harry as he's promised.
HARRY: He's back. He's back. Voldemort's back. Cedric, he asked me to bring his body back. I couldn't leave him, not there.
DUMBLEDORE: It's all right, Harry, it's all right. He's home. You both are.
Harry manages to escape Voldemort (for now), and he goes back to tell the others that their worst nightmare has come true: Voldemort is back in action. And he's angry.