Here's how it happens:
* The Prophecy: A prophecy made by Sybill Trelawney foretells a powerful wizard who has the power to vanquish Voldemort. This prophecy refers to both Harry Potter and Neville Longbottom.
* The Search for the Prophecy: Voldemort, still seeking immortality, learns of the prophecy through his servant, Severus Snape. He wants to find and destroy the prophecy, fearing it might reveal a threat to his own existence.
* Sirius Black's Escape: Sirius Black, wrongfully accused of murdering twelve muggle people and Peter Pettigrew, escapes from Azkaban prison.
* The First Appearance: Voldemort, disguised as a snake, enters the Ministry of Magic and uses his powers to possess the body of a young boy named Cedric Diggory, a student at Hogwarts.
* The Revelation: Harry Potter and his friends discover that Sirius Black was framed and that Peter Pettigrew is alive and working for Voldemort.
* The Duel: In a confrontation with Peter Pettigrew, Harry discovers that the prophecy is not about Neville but about him. In the ensuing duel, Voldemort is accidentally resurrected.
Voldemort's return is a crucial moment in the series, marking the beginning of the final conflict between good and evil. His return is not an immediate, physical resurrection but rather a return to power through his manipulation and use of other people. It's a gradual process that culminates in his physical return in *Goblet of Fire*.
The events leading up to Voldemort's return in *Prisoner of Azkaban* are crucial to understanding the plot of the later books and the consequences of his return to the wizarding world.