Poster of the film Harry Potter and the Philosopher's Stone [Photo/Mtime]

Twenty years ago, the story of a young wizard was launched in the Muggle world and stirred up a magical wave across the globe.

Since the release of the first novel, Harry Potter and the Philosopher's Stone, on June 26, 1997, the book series have earned immense popularity, critical acclaim and commercial success worldwide.

The series has been adapted into eight fantasy films and all received overwhelmingly positive critical reception.

The movie version of Harry Potter and the Philosopher's Stone earned more than $970 million at the box office worldwide, becoming the highest grossing film of 2001. It was nominated for many awards including the Academy Award for Best Original Score, Best Art Direction and Best Costume Design.

As we celebrate the 20 anniversary of Harry Potter, let’s review some cast members and see what they have changed over the years.