Actor Tom Felton gave Comic-Con convention-goers a sneak preview of boy wizard Harry Potter in the first cinematic instalment of Harry Potter And The Deathly Hallows.

Felton shared an exclusive clip of the forthcoming film in which Harry comes face to face with arch enemy Voldemort with about 6,000 people at the festival in San Diego, California.

Many of them had camped out overnight for a chance to see the footage.

The clip showed Harry, played by Daniel Radcliffe, and his pals navigating a dark world after Voldemort and his minions overtake the Ministry of Magic and Hogwarts.

It introduced Bill Nighy in his role as Rufus Scrimgeour and hinted at a confrontation between Harry and Ron Weasley.

Felton, who plays Draco Malfoy, said the cast was "incredibly proud" of the last two films.

He said it was tough to part from his castmates on the last day of shooting, adding that Radcliffe "cried like a girl".

The movie opens in November.

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