‘Harry Potter' series reveals cast: Paapa Essiedu, Janet McTeer and John Lithgow

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The new "" TV series solemnly swears to be absolutely magical.

Especially since HBO has finally confirmed the cast taking on Hogwarts School of Witchcraft and Wizardry’s most important characters: the professors.

Stepping into his role as Hogwarts headmaster Albus Percival Wulfric Brian Dumbledore is , taking up the mantle previously held by Richard Harris and then in the film series. Lithgow — whose already storied career spans more than 50 years — was already reaching him, even when his casting was still only rumored.

“Can you believe this has already started?” the "Conclave" star, 79, said on the March 24 . “Two weeks ago, somehow, other people had gotten wind of this and they were stopping me in airports.”

Joining Lithgow as Dumbledore’s right-hand professor Minerva McGonagall — previously portrayed by — is Janet McTeer, an English actress whose career boasts roles in "Ozark," "The Menu," "Albert Nobbs" and "Kaos."

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Rounding out Hogwarts’ most important professors — or gamekeepers — is Paapa Essiedu as antagonist Severus Snape (previously ) and Nick Frost as Rubeus Hagrid ().

Essiedu, a British actor who has enjoyed a successful career as a Shakespearean stage actor, has previously acted in onscreen projects such as "I May Destroy You," "The Lazarus Project" and "Gangs of London."

Frost, meanwhile, has appeared in comedic films such as "Hot Fuzz" and "Shaun of the Dead" and, in addition to screenwriting projects, lent his voice to Gueulfor in the "How to Train Your Dragon" franchise.

And finally, the last two roles announced in this first slate of characters include Luke Thallon as professor Quirinus Quirrell and Paul Whitehouse as caretaker Argus Filch.

So far, any casting news for the HBO series’ biggest characters — namely Harry Potter, Ron Weasley and Hermione Granger — remains under wraps.

The forthcoming HBO series, which was announced over a decade after the "Harry Potter and the Deathly Hallows: Part 2" came out in 2011, promises to turn each book into an individual season, including every spellbinding detail that had to be left out of the original movies.

And while there is a long time before fans will be able to step back into Hogwarts — with the series’ first installment — there’s plenty of TV expected this year to bridge the gap.