Warner Bros. and J.K. Rowling's "Fantastic Beasts and Where to Find Them" made its debut with $75 million in the domestic box office. Fans are least to say very delighted with the set of casts, especifically with the appearance of Johnny Depp. With this, the sequel is slated to hit theaters after two years.

Fans who turned "Fantastic Beasts and Where to Find Them" into a box-office champ this weekend found a magical surprise waiting in the film's final scenes, when it's revealed that Percival Graves (played by Colin Farrell) transformed into Gellert Grindelwald (played by Johny Depp), the villainous wizard who has been secretly hunting New York City for an Obscurus, a dangerous magical parasite.

To give more details, Grindelwald is the much-feared dark wizard who appeared briefly in J.K. Rowling's "Harry Potter" franchise, was a friend-turned-foe of Albus Dumbledore. The two first met in 1898 as teenagers and bonded over a search for the Deathly Hollows and a belief that wizards should operate openly and rule over Muggles. They remained close until Grindelwald accidentally killed Dumbledore's sister, Ariana, in a three-way duel with Albus and his brother Aberforth.

Dumbledore and Grindelwald would later face off in an epic wizarding war in 1945. In a plot twist, Rowling revealed during a 2007 chat that Dumbledore was gay and had always harbored feelings for Grindelwald, calling his love "a great tragedy."

"While Voldemort was brutish and ruled by fear, Grindelwald is much more sophisticated and can seduce anybody with what he wants to do," says "Fantastic Beasts and Where to Find Them" director David Yates, adding that the wizard possesses a presence and lethality felt by anyone with a wand. "He's a compelling speaker and he's playing a longer, cleverer, more dangerous game than the obvious, and therefore in some ways is perhaps to be more feared than Voldemort."

"The whole principle of casting is to go for the finest actors and finest artists you can," Yates says. "And Johnny Depp is a fine artist, he's created two or three of the most iconic characters in popular culture."

Since the "Fantastic Beasts and Where to Find Them" is slated to hit theatres for a sequel in 2018, fans could expect Johnny Depp's character, Grindelwald, to be one of the major characters and that he is expected to face the young Dumbledore. But the question is, who will play young Dumbledore?