Harry Potter fans are eagerly-awaiting the franchise's 20th Anniversary reunion, which will see the megastars of the movies meet up for a one-off special. And on Monday, excitement was set to reach fever pitch as a first look trailer for the upcoming HBO Max special was unveiled - with teasers of many of the stars. Daniel Radcliffe, Emma Watson and Rupert Grint are among those set to reunite for the Return To Hogwarts special on on New Year's Day, alongside other lead stars, who were featured in the teasing trailer showing a select few receiving invites. Cheeky! Harry Potter fans are eagerly-awaiting the franchise's 20th Anniversary reunion, which will see the megastars of the movies meet up for a one-off special The clip opens with an image of the vast clock at the front of Hogwarts before shooting to an image of the wizarding newspaper The Daily Prophet, with a front cover headline reading: 'Hogwarts welcomes back alumni'. Somebody who appears to be Emma dressed as wild-haired Hermione Granger moves the paper down to reveal the top of her head. The teaser then shoots to a suited Robbie Coltrane, who plays lovable giant Hagrid in the films, sitting in a London coffee shop, where he receives a letter - recognisable in paper and font as penmanship from Hogwarts. An address on the front reads: 'Robbie Coltrane, The Coffee Shop, Chelsea'. Hagrid... is that you? The teaser then shoots to a suited Robbie Coltrane, who plays lovable giant Hagrid in the films, sitting in a London coffee shop, where he receives a letter - recognisable in paper and font as penmanship from Hogwarts Reading away: An address on the front reads: 'Robbie Coltrane, The Coffee Shop, Chelsea' Next to receive an invitation is Matthew Lewis, who played Neville Longbottom, as he holds his letter, looking at the Hogwarts coat of armour and looking confused. Mark Williams, who depicts Mr Weasley, is then seen on what looks to be the Hogwarts Express while a hat clad female - seemingly Emma - is seen strutting down a bustling Platform 9 3/4, drawing the teaser to a close. News of the reunion came last month, as it was revealed the stars would come together to discuss the magic world and the eight film franchise. Daniel, who plays the titular role, Rupert, who plays Ron Weasley, and Emma have not made a public appearance together since the premiere of the last premiere of the franchise, Harry Potter And The Deathly Hallows Part 2, in July 2011. He's back: Next to receive an invitation is Matthew Lewis, who played Neville Longbottom, as he holds his letter, looking at the Hogwarts coat of armour and looking confused The trio of stars will be joining filmmaker Chris Columbus, who directed the blockbuster original film of the franchise Harry Potter And The Philosopher's Stone, to celebrate the movie which premiered 20 years ago today on November 16, 2001. Castmembers from all eight Harry Potter films will be reuniting for the retrospective special which is set to premiere on the WarnerMedia streaming platform on New Year's Day, January 1, 2022. According to HBO Max - where all films from the franchise could be streamed - the project will 'tell an enchanting making-of story through all-new, in-depth interviews and cast conversations.' Several talented actors will be joining the main three stars including Helena Bonham Carter, Ralph Fiennes, Tom Felton, Gary Oldman, Imelda Staunton, Bonnie Wright, Jason Isaacs, and many others. They're back! Emma , Rupert Grint, and Daniel Radcliffe, (seen left to right in 2001's Harry Potter And The Sorcerer's Stone) are among those set to reunite for the Harry Potter 20th Anniversary: Return To Hogwarts special on HBO Max Strutting her stuff: A hat clad female - seemingly Emma - is seen strutting down a bustling Platform 9 3/4, drawing the teaser to a close Casey Patterson whose production company is producing the special gushed over the cast as she said: 'There’s magic in the air here with this incredible cast, as they all return home to the original sets of Hogwarts, where they began 20 years ago. 'The excitement is palpable as they prepare to take their fans on a very special and personal journey, through the making of these incredible films.' Of the upcoming special, President of Warner Bros. Global Kids, Young Adults and Classics Tom Ascheim said: 'It has been an incredible journey since the debut of the ‘Harry Potter and the Sorcerer’s Stone’ film... 'Witnessing how it has evolved into this remarkable interconnected universe has been magical to say the least. This retrospective is a tribute to everyone whose lives were touched by this cultural phenomenon... Wah! Mark Williams, who depicts Mr Weasley, is then seen on what looks to be the Hogwarts Express Choo choo! The Hogwarts Express is seen pulling into the platform 'From the talented cast and crew who poured their heart and soul into this extraordinary film franchise to the passionate fans who continue to keep the Wizarding World spirit alive 20 years later.' The special will later air on channels TBS and Cartoon Network in spring 2022 before the theatrical release of Fantastic Beasts: The Secrets of Dumbledore. There will also be a first look of the special during the premiere of quiz competition show Harry Potter: Hogwarts Tournament of Houses which airs Sunday, November 28 on TBS and Cartoon Network and is hosted by Helen Mirren. Parting is such sweet sorrow: The English actors have not made a public appearance together since the premiere of the last premiere of the franchise, Harry Potter And The Deathly Hallows Part 2, in New York City back in July 2011 All rights reserved for this news site (dailymail) and under his responsibility