Warning: the following contains spoilers about Johnny Depp's upcoming role in Fantastic Beasts and its sequel.
A week after it was announced that Johnny Depp was joining the sequel to the upcoming Fantastic Beasts and Where to Find Them, his mysterious role has been revealed.
The film's director, David Yates, broke the news that Depp will be taking on the part of Gellert Grindelwald during an interview with The Leaky Cauldron on Tuesday. As previously reported, Depp will have a cameo in the first installment of the Fantastic Beasts franchise, hitting theaters Nov. 18.
"The whole principle of casting the movie was go with the best actor. Go for the most inspired, interesting, right fit for that character. And as we approached Grindelwald we thought, 'Who's going to take this in an interesting direction?'" Yates said.
As fans of the books will remember, Grindelwald (played by Jamie Campbell Bower in flashbacks of Harry Potter and the Deathly Hallows) was considered to be one of the most dangerous dark wizards of all time, stealing the Elder Wand and creating a murderous army before being defeated by Albus Dumbledore in a duel in 1945 and imprisoned in his own fortress.
Grindelwald was killed by Voldemort in 1998 after refusing to give up information on the Elder Wand. The character was also a former love interest of Dumbledore, before killing Dumbledore's sister, Ariana.
"We were excited about seeing what he would do with this guy, the character. He's fearless; he's imaginative; he's ambitious," Yates continued. "We thought he would do something fun and special. So we went for him, purely on that selfish basis. We don't care if he's famous or not famous. We just know he's interesting."
ET caught up with the Fantastic Beasts cast at the film's junket on Saturday, where it seems Depp's role was a secret even to them.
"I found out when the world found out," Katherine Waterston revealed. "If you're not in a scene with someone you don't know... I think I was the last to know that Johnny Depp was in the movie. Eddie [Redmayne] knows a little bit more than the rest of us."
PHOTOS: Johnny Depp through the years
Johnny Depp through the years
Johnny Depp through the years
HOLLYWOOD, CA - MAY 23: Actor Johnny Depp attends the premiere of Disney's 'Alice Through The Looking Glass' at the El Capitan Theatre on May 23, 2016 in Hollywood, California. (Photo by Michael Boardman/WireImage)
HOLLYWOOD, CA - MAY 23: Johnny Depp attends the premiere Of Disney's 'Alice Through The Looking Glass' at the El Capitan Theatre on May 23, 2016 in Hollywood, California. (Photo by Todd Williamson/Getty Images)
HOLLYWOOD, CA - MAY 23: Actor Johnny Depp arrives at the Los Angeles Premiere 'Alice Through The Looking Glass' at the El Capitan Theatre on May 23, 2016 in Hollywood, California. (Photo by Jon Kopaloff/FilmMagic)
LONDON, ENGLAND - MAY 10: Johnny Depp attends the European Premiere of 'Alice Through The Looking Glass' at Odeon Leicester Square on May 10, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - MAY 10: (L to R) Mia Wasikowska, Sacha Baron Cohen and Johnny Depp attend the European Premiere of 'Alice Through The Looking Glass' at Odeon Leicester Square on May 10, 2016 in London, England. (Photo by David M. Benett/Dave Benett/WireImage)
Johnny Depp and Amber Heard pictured on arrival to Southport Magistrates Court on April 18, 2016 in Southport, Queensland.
US actor Johnny Depp gestures during his photo call in Tokyo on January 28 2015. Depp attended the Japan premiere of his latest action comedy movie 'Mortdecai' on January 27 which will be screened in Japan from February 6. AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
CLEVELAND, AUSTRALIA - JUNE 2: (EUROPE AND AUSTRALASIA OUT) American actor Johnny Depp, dressed as 'Captain Jack Sparrow', greets locals at Cleveland in Redland City, Queensland, after a day of filming 'Pirates of the Caribbean: Dead Men Tell No Tales'. (Photo by Peter Wallis/Newspix/Getty Images)
HOLLYWOOD, CA - JANUARY 21: Actor Johnny Depp attends the premiere of Lionsgate's 'Mortdecai' at TCL Chinese Theatre on January 21, 2015 in Hollywood, California. (Photo by Jason Kempin/Getty Images)
Olivia Munn, Johnny Depp and Gwyneth Paltrow seen at the Los Angeles Premiere of Lionsgate's "Mortdecai" on Wed, Jan 21, 2015, in Hollywood. (Photo by Eric Charbonneau/Invision for Lionsgate/AP Images)
Actor Johnny Depp poses for a portrait in Beverly Hills, Calif., on Thursday, June 22, 2006. (AP Photo/Matt Sayles)
LONDON - JANUARY 10: Johnny Depp attends the Sweeney Todd film premiere held at the Odeon Leicester Square on January 10, 2008 in London, England. (Photo by Eamonn McCormack/WireImage)
Actor Johnny Depp poses for photographers at film premiere of "Pirates of the Caribbean: Dead Man's Chest," at the Disneyland theme park in Anaheim, Calif., on Saturday, June 24, 2006. (AP Photo/Matt Sayles)
POMPANO BEACH, FL - AUGUST 29: Johnny Depp greets fans after performing as part of the Sheila Witkin Memorial Reunion Concert at Club Cinema on August 29, 2008 in Pompano Beach, Florida. (Photo by Mike Franklin/FilmMagic)
HOLLYWOOD - FEBRUARY 24: Actor Johnny Depp and singer Vanessa Paradis attends the 80th Annual Academy Awards at the Kodak Theatre on February 24, 2008 in Los Angeles, California. (Photo by Jeff Kravitz/FilmMagic)
Actor Johnny Depp attends the premiere of the feature film "Mortdecai" in Los Angeles on Wednesday, Jan. 21, 2015. (Photo by Dan Steinberg/Invision/AP Images)
FRANCE - MAY 10: Festival of Cannes 97: Walking up the red-carpeted steps for 'The brave' in Cannes, France on May 10, 1997 - Kate Moss, Johnny Depp. (Photo by Pool APESTEGUY/BENAINOUS/DUCLOS/Gamma-Rapho via Getty Images)
Johnny Depp and Kate Moss during 'Donnie Brasco' Premiere at Century City Cineplex Odeon Cinemas in Century City, California, United States. (Photo by Barry King/WireImage)
Actor Johnny Depp (R) kissing girlfriend, supermodel Kate Moss (L). (Photo by Rose Hartman/The LIFE Images Collection/Getty Images)
Actor Johnny Depp attends the cast of 'Benny & Joon' present Planet Hollywood with memorabilias from the film on March 22, 1993 at Planet Hollywood, California.
BEVERLY HILLS,CA - MARCH 25: Actor Johnny Depp attends the 'Benny & Joon' Beverly Hills Premiere on March 25, 1993 at the WGA Theatre in Beverly Hills, California. (photo by Ron Galella, Ltd./WireImage)
CENTURY CITY,CA - FEBRUARY 1: Actress Winona Ryder and actor Johnny Depp attend 'The Silence of the Lambs' Century City Premiere on February 1, 1991 at Cineplex Odeon Century Plaza Cinemas in Century City, California. (photo by Ron Galella, Ltd./WireImage)
Actors Johnny Depp and Winona Ryder. (Photo by Time Life Pictures/DMI/The LIFE Picture Collection/Getty Images)
UNITED STATES - OCTOBER 01: Johnny Depp and Guest (Photo by The LIFE Picture Collection/Getty Images)
1995 file photo of Johnny Depp & Kate Moss (Photo by Barry King/WireImage)
1988 File Photo of Johnny Depp at the Nosotros Benefit in Los Angeles, California taken May 13, 1988 in Los Angeles, California (Photo by Barry King/WireImage)
Nicolas Cage & Johnny Depp (Photo by Barry King/WireImage)
Actor Johnny Depp attends the 18th Annual Los Angeles Police/Celebrity Golf Tournament on May 14, 1988 at Rancho Park Golf Course in Los Angeles, California.
SHERMAN OAKS,CA - DECEMBER 13: Actor Dustin Nguyen, actor Johnny Depp and actor Peter DeLuise attend the FOX Television Stars Feed the Homeless on December 13, 1987 at Sherman Oaks Galleria in Sherman Oaks, California. (photo by Ron Galella, Ltd./WireImage)
HOLLYWOOD - FEBRUARY 24: Actor Johnny Depp and singer Vanessa Paradis attend the 80th Annual Academy Awards at the Kodak Theatre on February 24, 2008 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
UNITED STATES - AUGUST 22: Matthew Perry and Johnny Depp in New York to promote their first network series on the Fox Network in 1987 (Photo by Vinnie Zuffante/Getty Images)
Johnny Depp and his girlfriend Vanessa Paradis arrive for the Los Angeles premiere of the movie 'Sleepy Hollow' November 17, 1999. (Photo by Brenda Chase/Online USA/Newsmakers)
HERBORN, GERMANY - MAY 29: Actor/Musician Johnny Depp of Hollywood Vampires performs onstage at Hessentags-Arena during the 56th Hessentag on May 29, 2016 in Herborn, Germany. (Photo by Andreas Rentz/Getty Images)
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"I did know when we came to shoot that moment," Redmayne agreed.
"I didn't get to work with him, so it was something that existed completely separate from me," Colin Farrell said. "I never had any scenes with him, so yeah, I think he came in way after I had finished."
While it's unclear whether Alison Sudol worked with Depp on-set of the first film, she couldn't contain her excitement over his addition to the cast.
"All of this is so surreal," she shared. "It's like one surreal moment after the next, and then to get to work with Johnny Depp -- he's just a legendary actor and so incredible and creates these amazing characters. So the fact that we get to be in a film with him -- we're not even sure what's going to happen in the next one -- but the fact that he's going to be in it at all [is amazing]."