The second Harry Potter film, The Chamber of Secrets, is going to be "really, really, really good" according to Chris Rankin - the actor who plays Percy Weasley.
He told Newsround what some of the new film's sets are like.
He said: "I've seen the Chamber of Secrets - and without spoiling any of the magic, it's wonderful and it's going to be a really, really, really good film."
But Chris will have to miss some of the performances to film the final scene of the second Potter movie - the feast.
And he revealed some details about the scenes he's already shot.
He said: "I've done a couple of corridor scenes with Tom Felton who plays Draco Malfoy. There was a good shouting match in that one - it was a lot of fun."
Hear story
Exclusive interviews with Potter actors
Chat about Potter
Vote: your fave thing!
'I'm a Harry Potter extra'
