Kit Harington replaces Nicholas Hoult in HBO's Harry Potter series

Kit Harington's casting marks his third role in a HBO series after Game of Thrones and the financial drama Industry Kit Harington is joining the highly anticipated Harry Potter TV series as the wizarding world's celebrity-turned-Hogwarts instructor Gilderoy Lockhart. X-Men star Nicholas Hoult was originally cast in the second series earlier this month but has now left due to scheduling issues, according to HBO.

Best known for playing Jon Snow in Game of Thrones, Harington also appears in BBC and HBO financial drama Industry. The star previously voiced Lockhart in an audio version of Harry Potter. "I'm a huge Potter fan.

For related coverage, explore our detailed analysis on Technology and Digital Systems.

Key Analysis and Detailed Timeline

I've got to be honest, he's one of my favourite characters," Harington told Collider , external . "So, to be offered to play him is a real dream. I've had a taste of him [in the audiobook] and felt my way around him.

He's just a wonderful creation." Harry Potter and the Philosopher's Stone is due to premiere this Christmas on HBO Max. Season two will adapt the second book in the series "Before we begin year two at Hogwarts, there has been a slight change due to schedule: Kit Harington will be stepping into the role of Gilderoy Lockhart," an HBO statement shared , external .

The new series adaptation of the best-selling books stars newcomer Dominic McLaughlin as the boy wizard, Alastair Stout as his best friend Ron Weasley and Arabella Stanton as the young witch Hermione Granger. Oscar-nominated actor Jon Lithgow has been cast as Hogwarts headmaster Albus Dumbledore and Nick Frost will play gamekeeper Rubeus Hagrid.

Read More: Girl, 17, killed in Swedish sword attack, police say

The new series stars Alastair Stout as Ron Weasley, Dominic McLaughlin as Harry Potter and Arabella Stanton as Hermione Granger.

Broader Impact and Sector Outlook

The show could reunite Harington, who has shared he is a lifelong fan of the books, with director and producer Mark Mylod, who worked on Game of Thrones and is directing some Harry Potter episodes. Mylod is an executive producer on the new series along with author JK Rowling.

Lockhart was portrayed in the Harry Potter films The vain wizard, who authored several books on his purported encounters with dark creatures, serves as Hogwarts' latest professor for the defence against the dark arts and fancies himself as a mentor to Harry in his second year.

Hoult, along with other cast members, has faced some backlash for his decision to join the show from those who are opposed to Rowling's views on gender identity and trans rights. Representatives for Harington and Hoult did not immediately respond to requests for comment.

The HBO series is expected to take 10 years to complete, as producers plan multiple seasons covering each of Rowling's seven books, which the eight blockbuster films were originally based on.

Nicholas Hoult joins Harry Potter TV show - see the cast so far John Lithgow: Playing Dumbledore will 'define me' Harry Potter TV show trailer: Everything we know so far