The trailer for Harry Potter And The Chamber Of Secrets will be shown in UK cinemas from today.
The trailer has also been posted on the film's official website.
It gives a glimpse of Harry and Draco Malfoy duelling in the Great Hall at Hogwarts.
The trailer, at http://harrypotter.warnerbros.com, also shows Harry, Ron and Hermione drinking Polyjuice Potion and Harry writing in a mysterious diary.
The trailer ends with Ron asking: "Can we panic now?"