HBO has released 15 new images from the upcoming fourth season of Games of Thrones, which premieres April 6.

The season adapts approximately the second half of A Storm of Swords, the third novel in George R.R. Martin's fantasy epic A Song of Ice and Fire. We won't spoil anything here, except to say the Red Wedding was only the beginning of the surprises.

Created by David Benioff and D.B. Weiss, Game of Thrones stars Peter Dinklage, Lena Headey, Emilia Clarke, Charles Dance, Nikolaj Coster-Waldau, Alfie Allen, Diana Rigg, Natalie Dormer, Kit Harington, Sophie Turner, Maisie Williams and Isaac Hempstead Wright, and in Season 4 features new additions Pedro Pascal, Michiel Huisman and Indira Varma.