12 Harry Potter Actors Who Were Replaced In The Sequels
5. Helena Ravenclaw - Nina Young
The Replacement: Kelly Macdonald
Though shes only in the first film very briefly, Nina Young appears as Hogwarts ghost The Grey Lady - later revealed to be Helena Ravenclaw - for a few moments.
Young was eventually replaced for the final movie by Scottish actress Kelly MacDonald for the more important role when Harry visits Helena to learn about the diadem horcrux.
By the time that film came round, the role needed more of an established actor - though Young did have experience in Tomorrow Never Dies and Sliding Doors. Clearly MacDonald fit the bill better for David Yates, and it was an admittedly impressive supporting performance.