Dumbledore shares his memories of You-Know-Who with Harry in first look at No. 6.

It's hard to believe He-Who-Must-Not-Be-Named was once just A-Cute-Little-Kid (albeit a cute little kid who can punish people, move things with his mind and talk to snakes).

We get a nice long look at young Tom Riddle (played by Voldemort's real-life nephew, Hero Fiennes-Tiffin) in the exclusive trailer for 'Harry Potter and the Half-Blood Prince.'

We're digging the structure of this one: It plays out more like a clip than it does a preview. Watch the trailer in HD here, and also check out where the Dark Lord ranks on our list of the Top 25 Movie Villains of All Time.