(Creepy music) Dumble: What you are looking at are memories, in this case pertaining to one individual. Dumble: This is perhaps the most important memory I've collected. Dumble: I'd like you to see it. -+-+-+- Woman: In all the years Tom's been here, he's never once had a visitor. Tom: You're the doctor, arn't you? Dumble: No. Tom: Who are you? Dumble: Well, I'm like you Tom, I'm different. Tom: Prove it. (Set's the closet on fire.) Tom: I can make things move without touching them. Tom: I can make bad things happen to people who are mean to me. Tom: I can speak to snakes too. They find me. Whisper things. -+-+-+- Harry: Did you know, sir? Then? Dumble: Did I know that I had just met the most dangerous dark wizard of all time? Dumble: ...No.

Harry Potter and the Half-Blood Prince
Teaser Trailer
(1:42)