Harry Potter 20th Anniversary: Return to Hogwarts will air on New Year's Day on Sky and NOW, and also see the likes of Tom Felton (Draco Malfoy), Imelda Staunton (Delores Umbridge), Matthew Lewis (Neville Longbottom), Gary Oldman (Sirius Black) and Robbie Coltrane (Rubeus Hagrid), among others, reminiscing about the films.
For the uninitiated, the Harry Potter films were based on the novels of the same name, and were about a boy wizard who went to Hogwarts School Of Witchcraft And Wizardry and took on his nemesis Voldemort, who had tried to kill him when he was a baby.
Seven books were made into eight films by Warner Bros, which went on to be the fifth-biggest franchise in movie history. Two Fantastic Beast spin-off films were also released, with a third due out next year.
Also coming to Sky is Harry Potter: Hogwarts Tournament of Houses on 27 December - a four-part event hosted by Helen Mirren that will pit Potter fans against each other to win the House Cup.