Harry Potter and the Goblet of Fire

Harry was chosen as a fourth champion because Barty Crouch Jr., disguised as Professor Moody, used a powerful Confundus Charm on the Goblet of Fire to ensure Harry's name would be selected. Crouch wanted Harry to compete so he could guide him through the tournament tasks and ultimately deliver him to Voldemort. Despite Harry being underage and only three schools were supposed to be represented, the magical contract bound him to compete.

The opening nightmare about Voldemort and Pettigrew planning something at the Riddle House hints at the deeper conspiracy unfolding.

Barty Crouch Jr. used Polyjuice Potion to transform into Moody throughout the school year. He was secretly rescued from Azkaban by his father, Barty Crouch Sr., who kept him under house arrest. Crouch Jr. then escaped and was recruited by Voldemort to help orchestrate Harry's delivery to him. The real Moody was imprisoned in a magical trunk hidden in Moody\'s own office.

Moody's oddly helpful behavior toward Harry, particularly in the first task, seems suspicious in retrospect.

Voldemort needed Harry's blood because the prophecy stated that Harry was the only one who could defeat him, and Voldemort believed using Harry's blood would make him immune to the protection Harry's mother gave him when she died. This protection came from Lily Potter's sacrifice, which Voldemort did not understand. By taking Harry's blood, Voldemort inadvertently ensured the protection would live on in his own veins.

The prophecy about the boy who lived and Voldemort's obsession with Harry foreshadows this connection.

Priori Incantatem is a phenomenon that occurs when two wands that share a core from the same magical creature (like Harry and Voldemort's phoenix feather cores) duel against each other. The weaker wand's previous spells are forced to manifest in reverse order, releasing the shadows of the people it last killed. This is why Harry saw the spirits of Cedric, his parents, and others when Voldemort's Killing Curse hit his.

Earlier references to wand cores and allegiance foreshadow this magical connection between Harry and Voldemort.

Barty Crouch Jr., disguised as Moody, enchanted the Triwizard Cup to be a Portkey that would transport the winner directly to the Little Hangleton graveyard. This was done so that whoever won the tournament would be delivered to Voldemort. Crouch set up the maze to ensure Harry would be the one to reach the cup, though Cedric happened to touch it at the same time.

Moody's excessive interest in ensuring Harry wins the tournament becomes clear with this revelation.

Barty Crouch Sr. was murdered by his own son, Barty Crouch Jr., who used a powerful curse to kill him after discovering him in the forest. Crouch Sr. had been searching for his son after the younger Crouch escaped from his house. The murder was part of Voldemort's plan to keep Crouch Jr.'s involvement in the conspiracy secret.

Harry's earlier nightmares about the Riddle House featured the same murder methodology.

Ron felt betrayed because he believed Harry had somehow found a way to enter his name in the Goblet of Fire without telling him. Since Harry was underage and Ron knew he hadn't told anyone about entering, Ron thought Harry had kept a secret from him and potentially cheated. This hurt their friendship, especially since Ron was also eligible and had wanted to compete.

Ron and Harry's earlier rivalry over Quidditch and attention foreshadows this jealousy.

Harry was having nightmares about the Riddle House because Voldemort was using their magical connection to project visions into Harry's mind. Voldemort wanted Harry to witness the preparations for his resurrection and to draw Harry closer to him. These dreams were a form of magical communication that Voldemort exploited throughout the series.

The opening scene establishes that Voldemort is reaching out to Harry before the main plot begins.

The real Professor Moody was imprisoned in a magical trunk in his own office throughout the entire school year. Barty Crouch Jr. captured him, locked him in the trunk, and used Polyjuice Potion to impersonate him. Moody was kept alive but unconscious, only rescued at the end when Dumbledore and others discovered the truth.

The real Moody's distinctive magical eye and paranoid behavior are mimicked by Crouch Jr.

Cedric was killed because Voldemort wanted Harry specifically, not Cedric. When both boys touched the Triwizard Cup (a Portkey), they were transported to the graveyard. Pettigrew was ordered to kill the "spare" (Cedric) to keep the ritual secret, and Voldemort saw no use for Cedric. His death was a senseless murder to eliminate a witness.

The Prefects' bathroom scene where Cedric advises Harry hints at his noble character before his tragic end.

The Death Eaters conjured the Dark Mark at the World Cup to instill fear and demonstrate Voldemort's returning power. Barty Crouch Jr., disguised as Moody, was the one who actually cast the spell using Harry's wand, framing it as a terror attack. This event served to remind the wizarding world that Voldemort's followers were still dangerous and active.

This attack establishes the rising threat of Death Eaters that culminates in Voldemort's return.

Neville Longbottom gave Harry Gillyweed, a magical plant that allowed Harry to breathe underwater for an hour and gave him gills to swim like a fish. This enabled Harry to dive into the Black Lake and rescue Ron, who had been taken as the "treasure" Harry needed to save. Without the Gillyweed, Harry would have drowned or failed the task.

Neville's earlier struggles with Herbology pay off as his knowledge of magical plants becomes crucial.

Voldemort's return marked the end of Harry's relatively peaceful life at Hogwarts and forced him to accept his role in the prophecy. This was the first time Harry faced Voldemort directly since as a baby and survived. The experience traumatized him, killed Cedric, and set up the eventual final battle between them. Harry realized he could not avoid his destiny any longer.

Harry's recurring dreams about Voldemort throughout the series build toward this direct confrontation.