Harry and Cedric are currently tied for first place, so they go first into the maze, followed by Krum and Fleur. Harry's path is remarkably quiet. He runs into a dementor, and at one point he runs through a mist that temporarily turns the world upside down. Harry passes the Skrewt. He hears Krum mutter, "Crucio", and Cedric screams and saves Cedric by stunning Krum. Harry sees the Triwizard Cup ahead. He and Cedric both run for it.
He and Cedric both run for it. They encounter a giant spider, Harry breaks his leg in the process. Unable to decide who should have the trophy, since they both helped each other out throughout the tournament, they touch it at the same time, both winning. They do, and the Cup, it turns out, is a portkey.
They arrive in a graveyard miles away from Hogwarts, then a hooded silhouette walks towards them carrying what looks like a baby. All of a sudden, pain is piercing through his scar. The thing that is being held says 'Kill the spare' and hooded figure says 'Avada Kavdra' in a cold cruel voice, Cedric drops to the floor.
Back at Hogwarts
Harry is tied to a tombstone by a guy he notices as Wormtail, Voldemorts helpful servant and he creates a potion and puts the head in the potion.
Voldemort rises from the cauldron and challenges Harry to a duel. Harry and is put under a curse and must say yes. The duel commences and as Voldemort screams 'Avada Kedavra' Harry screams 'Stupefy!' and disarms in time to escape back to Hogwarts with Cedric's body.
As he returns back to Hogwarts, he is weak and has been dragged into Moody's office. Where he reveals that he isn't the real Alastor Moody and is actually Barty Crouch's son who has escaped from Azkaban and will now kill him.