Harry Potter and Game of Thrones Crossovers

1 Jim Broadbent

Image Source: HBO

Jim Broadbent joined the Game of Thrones cast in season seven, making him the latest Harry Potter cast member to cross over. He plays Maester Ebrose who mentors Sam in Oldtown.

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Jim Broadbent as Professor Horace Slughorn

Image Source: Everett Collection

Broadbent played the potions professor who unlocked key secrets for Harry.

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2 Michelle Fairley as Catelyn Stark

Image Source: HBO

Game of Thrones' Lady Stark is one of the series' fiercest mothers . . .

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Michelle Fairley as Mrs. Granger

Image Source: Warner Bros.

And in the Harry Potter series, Fairley played the mother of one of the franchise's fiercest witches: Hermione Granger.

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3 David Bradley as Walder Frey

Image Source: Everett Collection

Hey, remember the giant jerk face who betrays the Starks and hosts the horrible Red Wedding? David Bradley plays him on Game of Thrones, and he is also a notorious character in Harry Potter.

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David Bradley as Argus Filch

Image Source: Everett Collection

Bradley is also Filch, the Hogwarts caretaker, who creeps out the kids with his cat, Mrs. Norris.

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4 Natalia Tena as Osha

Image Source: HBO

Natalia Tena played the wildling woman who helped Bran and Rickon escape from Winterfell.

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Natalia Tena as Nymphadora Tonks

Image Source: Everett Collection

Tena is also a memorably kickass woman in the Harry Potter series: Tonks, the wizard of many hair colors.

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5 Ciarán Hinds as Mance Rayder

Image Source: HBO

Ciarán Hinds was the fierce leader of the free folk before being sentenced to death by Stannis Baratheon.

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6 Ciarán Hinds as Aberforth Dumbledore

Image Source: Everett Collection

Hinds also shows up toward the end of the Harry Potter franchise as Dumbledore's brother Aberforth.

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7 Freddie Stroma as Dickon Tarly

Image Source: HBO

In season six, Stroma played Dickon Tarly, the brother of Jon Snow's BFF Sam. (He was later recast with Tom Hopper.)

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Freddie Stroma as Cormac McLaggen

Image Source: Everett Collection

Back in the day, Stroma was flirty quidditch player Cormac. He's one of the many Hogwarts students to go on to other things.

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8 Julian Glover as Grand Maester Pycelle

Image Source: HBO

The Lannister advisor is played by a man who's also heard in Harry Potter . . .

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Julian Glover as Aragog

Image Source: Warner Bros.

Yes, Harry Potter's scary giant spider Aragog is voiced by the Game of Thrones veteran.

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9 The Dillane Family Connection

Image Source: Everett Collection

Now, this crossover isn't as simple as the same actors appearing in both franchises, but it's too weird not to mention. Stay with us: Stephen Dillane and Frank Dillane are father and son, seen here promoting their 2012 film Papadopoulos & Sons (in which they also play father and son).

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Stephen Dillane as Stannis Baratheon

Image Source: HBO

Now, the elder Dillane is best known as Game of Thrones' would-be king Stannis.

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Frank Dillane

Image Source: Everett Collection

And Dillane junior played Harry Potter's villain Voldemort as a youngster (and is now also on Fear the Walking Dead). Got it?

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