The show is set to take place thousands of years before what we've seen on Game of Thrones.
The show's description also alludes to how the White Walkers came to be, the mysteries of the East, and the Starks, adding that "it's not the story we think we know."
Now, we have a cast list!!!
Jamie Campbell Bower and Toby Regbo, who actually acted together as young Grindelwald and young Dumbledore in Fantastic Beasts: The Crimes of Grindelwald, have officially joined.
Naomi Watts and Josh Whitehouse were previously announced as cast members.
Other actors joining the cast include Georgie Henley, (Lucy in the Chronicles of Narnia films), and Ivanno Jeremiah (Black Mirror episode 'Shut Up and Dance.')
Naomi Ackie, Denise Gough, Sheila Atim and Alex Sharp will also join the show.
HBO has been very quiet about what roles each actor will be playing.