1. Natalia Tena Warner Bros., HBO Natalia played the role of the one Nymphadora Tonks in Harry Potter who, of course, went on to have Teddy with Remus Lupin. She also appeared as Osha — who traveled with and watched over Rickon Stark — in Game of Thrones. 2. Michelle Fairley Warner Bros., HBO Michelle made a very quick appearance as Hermione Granger's mother in Harry Potter and the Deathly Hallows (Part I). However, Game of Thrones fans might recall her memorable role as Catelyn Stark. 3. David Bradley Warner Bros., HBO David played the role of the one and only Hogwarts caretaker Argus Filch in Harry Potter. In a slightly similar fashion, he portrayed the wicked Walder Frey — head of House Frey — in Game of Thrones. 4. Ciaran Hinds Warner Bros., HBO Ciaran portrayed Albus Dumbledore's brother, Aberforth Dumbledore, in Harry Potter and the Deathly Hallows (Part II). He also appeared as "King-Beyond-the-Wall" Mance Rayder in Game of Thrones. 5. Freddie Stroma Freddie appeared as a fellow Gryffindor and Quidditch master Cormac McLaggen in Harry Potter. He also graced our screens as Samwell Tarly's younger brother Dickon in Game of Thrones. 6. Jim Broadbent Warner Bros., HBO Jim appeared in Harry Potter and the Half-Blood Prince as Professor Slughorn, known for openly choosing favorite students for his Slug Club. He also played Archmaester Ebrose — the one who told Sam he shouldn't try to cure Ser Jorah's greyscale — in Game of Thrones. 7. Ralph Ineson Warner Bros., HBO Ralph played the evil Amycus Carrow in Harry Potter. He also portrayed Dagmer in Game of Thrones (he helped Theon Greyjoy take Winterfell). 8. Julian Glover Warner Bros., HBO Julian voiced the enormous spidered named Aragog in Harry Potter and appeared as Grand Maester Pycelle in Game of Thrones. 9. Bronson Webb Warner Bros., HBO Bronson had a small role in Harry Potter playing Pike, a Slytherin friend of Draco Malfoy. He also was one of the very first deaths in Game of Thrones when he portrayed Will, the Night's Watch ranger. 10. Nicholas Blane Warner Bros., HBO Nicolas had a blink-and-you-miss-it role in Harry Potter as Bob, a wizard at the Ministry of Magic. He also appeared in Game of Thrones as the Spice King. 11. Sally Mortemore Warner Bros., HBO Sally portrayed the Hogwarts's librarian Madame Irma Pince in Harry Potter as well as a Braavosi woman on Game of Thrones. Need more Game of Thrones before next week's episodes? Check out all our Game of Thrones coverage here.