US fans told us they've seen the bit where Malfoy hits Harry with a spell, the flying car and lots of Dobby.
The trailer will be shown throughout the summer, up until the film is released in November.
And it can also been seen from Friday on the official Harry Potter website - see our link on the right.
The Chamber of Secrets follows the adventures of Harry Potter as he continues in his second year at Hogwarts.
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