The scheme that results in Harry Potter's name being entered into the Goblet of Fire is fairly complicated, so let's break it down.

Goblet of Fire is arguably the most important Harry Potter sequel, as it brought Lord Voldemort (Ralph Fiennes) back to life, but also created a strange problem for the franchise.

Robert Pattinson as Cedric Diggory aims a wand at someone off-screen in Harry Potter and the Goblet of Fire. Image via Warner Bros. Twenty years after Harry Potter and the Goblet of Fire first ...

In "Harry Potter and the Goblet of Fire," someone enters Harry into the Triwizard Tournament as a trap. So who did it, and why?