Harry Potter and the Half-Blood Prince Trailer

A fourth trailer for Harry Potter and the Half-Blood Prince Movie was released online on April 16, 2009. This trailer features Harry Potter and Dumbledore in a seaside cave, Inferi is revealed for the first time and approximately midway through the clip, Katie Bell is seen suspended in air, screaming at the top of her lungs.EW: New Harry Potter Trailer Drops (April 16, 2009)

Previous Trailers

The first official trailer for Harry Potter and the Half-Blood Prince was released on July 29, 2008, at 9 pm EST.USA Today: 'Potter' trailer unveils a young Voldemort (July 28, 2008) The Harry Potter and the Half-Blood Prince international teaser trailer appeared online on October 27, 2008. Dumbledore asks Harry Potter to protect his fellow students from a dark, powerful magic that is trying to invade the school. Over the course of the trailer, Harry battles the evil powers, disappears, is introduced to a room of other people's memories and even garners the attention of a girl.Trailer Addict: Half Blood Prince Int. Teaser Trailer (Time: 1:26)

The original theatrical trailed made its debut before the premiere of The Mummy: Tomb Of The Dragon Emperor on August 1, 2008.USA Today: 'Potter' trailer unveils a young Voldemort (July 28, 2008)

The clip opens with with Dumbledore showing Harry Potter a room full of vials. They are the Dumbledore's collected memories. He pulls one from a case and asks Potter to see it. The memory he experiences, is the day Dumbledore met the child Tom Riddle. Tom Riddle explains that he has magical powers and can communicate with snakes. The trailer cuts between Tom Riddle as a boy and him as the adult wizard Voldemort. At the conclusion of the memory, Dumbledore declares that Voldemort is the most "dangerous dark wizard of all time."MTV Movies Blog: What Does The New Harry Pottery Trailer Mean? (Time: 1:39) (July 30, 3008)

Young Voldemort

The Harry Potter and the Half-Blood Prince Movie trailer, released on July 29, 2008, features the young Tom Riddle, who grows up to become the evil Lord Voldemort (Ralph Fiennes). In the film, Riddle is portrayed by Fiennes' nephew, 10-year-old Hero Fiennes-Tiffin.Chicago Sun-Times: Potter trailer shows Voldemort as kid (July 30, 2008)

March 2009 Trailer

A trailer for Harry Potter and the Half-Blood Prince was posted online on March 6, 2009. The trailer opens with Dumbledoor telling the story of Tom Riddle. Riddle was once a student who made several horrible choices. He ultimately turned to dark magic and became the evil wizard they know as Voldermort. The rest of the story shows Harry and his friends battling the evil wizard through, snow, fire and explosions.MTV: Half Blood Prince Trailer (Time: 1:55)