Who Put Harry's Name in the Goblet of Fire?

Harry's name was put into the Goblet of Fire by Barty Crouch Jr., a Death Eater who spent the whole school year disguised as the new Defense Against the Dark Arts teacher, Mad-Eye Moody, using Polyjuice Potion. He bewitched the Goblet so that it would choose Harry as a fourth champion.
His plan was to make sure Harry won the Tournament, so that Harry would be the first to touch the Triwizard Cup, which had been turned into a Portkey to take him straight to Voldemort.
| Question | Answer |
|---|---|
| Who did it? | Barty Crouch Jr., disguised as Mad-Eye Moody |
| How? | He entered Harry under a fourth school and confused the Goblet |
| Why? | To deliver Harry to Voldemort through the Cup |
| Where was the real Moody? | Locked in a magical trunk all year |
| When is it revealed? | Right after the third task, in chapter 35 |
What happened when Harry's name came out?
At Halloween, the Goblet of Fire chose three champions, one from each school: Fleur Delacour, Viktor Krum and Cedric Diggory. Then it spat out a fourth slip of paper with Harry's name. Harry was too young and had not entered, but Mr. Crouch ruled that the Goblet's choice was a binding magical contract. Moody, apparently suspicious, argued that someone must have used powerful magic.
↑ Back to the topHow did Barty Crouch Jr. trick the Goblet?
The Goblet was protected by an Age Line drawn by Dumbledore. The impostor Moody, a skilled adult wizard, used a strong Confundus Charm to convince the Goblet there were four schools in the tournament and entered Harry's name as the only candidate from the fourth school, so the Goblet had to choose him.
↑ Back to the topWhy did they want Harry in the tournament?
Voldemort needed Harry's blood to return to a full body. The Triwizard Cup would be turned into a Portkey that carried whoever touched it to the graveyard where Voldemort was waiting. All year the false Moody secretly helped Harry: he hinted at how to beat the dragon, arranged for Neville to receive a book about gillyweed and cleared Harry's path through the maze.
↑ Back to the topHow is the truth revealed?
After Harry returns with Cedric's body, Moody hurries him to his office and reveals that he serves Voldemort. Dumbledore, Snape and McGonagall burst in. When the Polyjuice Potion wears off, Moody turns into Barty Crouch Jr., the son of Mr. Crouch, who had been smuggled out of Azkaban. Under Veritaserum he confesses everything. The real Moody is found in a magical trunk. Before Crouch Jr. can testify, a Dementor brought by Cornelius Fudge performs the Kiss on him.
↑ Back to the topMore about Harry Potter and the Goblet of Fire
This guide discusses the whole plot, including the ending.