Two actors will be joining the "Fantastic Beasts and Where to Find Them" cast, one of whom is familiar and beloved among many fans of the "Harry Potter" series. 

Jude Law has been confirmed to play young Albus Dumbledore, a role which was previously portrayed by Richard Harris and Michael Gambon, who took over the role following Harris' death. "Harry Potter" fans know that, at some point in the story, Dumbledore will duel with and claim victory over his former friend and possible lover Gellert Grindelwald (Johnny Depp), the dark wizard who initiated a magical war. However, it is unknown yet how this story ties together with Newt Scamander (Eddie Redmayne), the lead protagonist in the movie series, and his propensity for taking on magical beasts.

Callum Turner will be taking the role of Scamander's brother, according to Variety. Little is known about this character. Unlike the "Harry Potter" movie series, whose plot was known to fans because of the novels, the story of "Fantastic Beasts and Where to Find Them" was written specifically for film, so viewers do not know much about what will happen in the next four flicks. 

Meanwhile, J.K. Rowling, who is currently revising the script of "Fantastic Beasts and Where to Find Them 2," recently revealed a tantalizing bit of news on her Twitter account about the film.

Rowling, who is highly active on Twitter, was asked by a fan what the Patronus of Scamander is. Her response was, "Big spoiler."

In the "Harry Potter" universe, Patronuses will depend on the wizard's or witch's personality. It can also change form depending on the events in the spellcaster's life. As such, Rowling's hint indicates that the character's Patronus will tie closely to the storyline of the film. Given his affiliation with magical beasts, there is a lot fans can choose from when speculating what form it will take.

"Fantastic Beasts and Where to Find Them 2" is slated for release on Nov. 16, 2018. It will be set in Paris, according to Metro. Little has been revealed about the film's plot.