The first trailer for the third Harry Potter film has made its debut on the internet.
The trailer features Harry's rival Draco Malfoy performing magic
Harry Potter And The Prisoner of Azkaban is directed by Alfonso Cuaron, taking over from Chris Columbus who made the first two films in the series.
The clip features footage of new cast member Gary Oldman as Sirius Black, as well as Michael Gambon, who replaces the late Richard Harris as Dumbledore.
It will be shown in cinemas from Friday, with the film released in June.
The film marks the return of teenage Harry (Daniel Radcliffe), Rupert Grint (Ron Weasley) and Emma Watson (Hermione) to Hogwarts School for a third year of study.
The trio of young wizards must uncover the mystery surrounding an escaped prisoner who poses a threat to the wizard.
Other actors making their Harry Potter debut for the third film include Emma Thompson and Julie Christie.
The film revolves around a mysterious prisoner who threatens Harry
The trailer for the new film, which is on its official website, includes shots of a snow-covered town with an animated "missing person" poster and Professor Snape's (Alan Rickman) robes changing into women's clothes in front of his pupils' eyes.
The new film looks darker than the previous two instalments. Cuaron, a 41-year-old Mexican director, is best known for Y tu Mama Tambien, a critically-acclaimed road movie released last year.
Star Daniel Radcliffe recently announced he would continue to play Harry in the fourth film, The Goblet of Fire, but was not sure if he would still play the boy wizard for the fifth adventure, The Order of the Phoenix.
The films are based on the books by JK Rowling, who has become the wealthiest woman in the UK thanks to their success.