A new Game of Thrones season 4 trailer has been released, featuring behind-the-scenes footage and new interviews with the cast and crew.

HBO released the behind-the-scenes trailer for Game of Thrones this week, and the consensus among the cast and crew is that season 4 may be the best season yet.

"The scripts are impeccable," Charles Dance (who plays Tywin Lannister) says in the trailer. "We have terrific directors, and dare I say bloody good actors, and absolutely compelling storylines."

Executive producer Frank Doelger notes that there will be many new elements to the show in season 4.

"They've introduced some new characters, new cities, whole new plot elements that, taken together, surpass the success of the first three seasons brilliantly," Doelger says.

Other actors, such as Peter Dinklage (Tyrion Lannister) and Gwendoline Christie (Brienne of Tarth), explain that the show keeps getting better.

"The story just gets more intense and complex." Christie raves.

Game of Thrones Season 4 Spoilers: Cast Previews 'Lots of Death' as Daenerys Becomes More Confident

Game of Thrones season 4 is introducing several new characters in season 4, including Oberyn Martell, a.k.a. The Red Viper (Pedro Pascal) and Mace Tyrell (Rodger Ashton-Griffiths). The Red Viper is a visiting lord who attends the wedding of Joffrey (Jack Gleeson) and Margaery (Natalie Dormer) and goes on to become important. Mace Tyrell is Margaery and Loras' (Finn Jones) father.

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Game of Thrones season 4 premieres on Sunday, April 6 at 9 p.m. on HBO.

Watch the Game of Thrones season 4 behind-the-scenes trailer here: