A major character from the Harry Potter novels and films will reportedly return in Fantastic Beasts: The Crimes of Grindelwald: Transfiguration professor, deputy Headmistress, and Head of Gryffindor House, Minerva McGonagall.
According to Pop Culture, a younger version of McGonagall is set to appear in The Crimes of Grindelwald and will be portrayed by 35-year-old Irish actor Fiona Glascott. Glascott had previously been cast in the film in an unknown role. McGonagall was famously portrayed by Dame Maggie Smith in the Harry Potter films.
McGonagall's addition to The Crimes of Grindelwald will, however, leave avid fans of Harry Potter with some questions. The Crimes of Grindelwald is reportedly set just months after the events of the first film, which took place in 1926, and McGonagall was seemingly born around 1935. This may mean that McGonagall's age and year of birth will be retconned. Author J.K. Rowling has not been afraid to retcon certain elements of the original series of novels with The Crimes of Grindelwald, most notably Nagini's origin.
McGonagall originally began her time as a professor at Hogwarts in 1956, two years removed from completing her studies at Hogwarts, after which she spent a short stint with the Ministry of Magic. This means McGonagall graduated Hogwarts in 1954 and likely started at the school around 1947. As she was around twelve when she started at the school, her birth year would then be around 1935. Given the reported timeline of The Crimes of Grindelwald and Glascott's age, it appears unlikely that McGonagall would appear in The Crimes of Grindelwald with her original backstory intact.
Hitting theaters on November 16, Fantastic Beasts: The Crimes of Grindelwald is directed by David Yates and written by Harry Potter author J.K. Rowling. Rowling, David Heyman, Steve Kloves, and Lionel Wigram serve as producers. The film stars Eddie Redmayne, Jude Law, Johnny Depp, Katherine Waterston, Alison Sudol, Dan Fogler, Ezra Miller, Zoë Kravitz, Fiona Glascott and Callum Turner.