[Warning: Spoilers ahead for Sunday's episode of Game of Thrones, "Two Swords"]
The Red Viper has been unleashed.
Game of Thronesfans were treated to a sensual and violent introduction to new breakout character Oberyn Martell in Sunday's season premiere, which let fans of the show who haven't read the books see what all the fuss is about.
The young heroine is the most-tweeted about character leading up to Sunday's season 4 premiere. She tops the No. 2 most-tweeted about character, Joffrey, by 100,000 tweets. Fan-favorite Tyrion comes at No. 3, with a little more than 57,000 tweets. And here's a shocker: Hodor (No. 8) bested Jon Snow (No. 9).
The plucky young heroine ended season three of Game of Thrones learning of her mother and brother's deaths at the Red Wedding – just as she was about to be reunited with them. In season four, she's dealing with the traumatic fallout from that.
"She's experienced so much and had so much ripped away from her so brutally that anyone that age – it's going to affect them," actress Maisie Williams tells The Hollywood Reporter.
Game of Thrones is back Sunday – and that means even more jostling for power as families scramble to claim the Iron Throne. Below we break down the field for season four, where Westeros is the Lannisters' to lose, and the far-flung Starks face a long road to recovery.
Last season, Samwell Tarly (John Bradley) began making the transition from frightened boy to (relatively) brave man. He killed a White Walker and safely ushered his love interest Gilly and her son back to Castle Black.
When Game of Thrones picks up with Sam, he's feeling brave, with a greater sense of "self worth," Bradley tells The Hollywood Reporter.
But it's not all good for Sam's loved ones. Bradley says when reading the scripts for season four, he saw a side of Sam he hadn't before.
When we last saw Bran Stark (Isaac Hempstead-Wright) on Game of Thrones, he and his band of children (plus trusted ally Hodor) were marching north of The Wall -- for what purpose, none of them knows exactly. But it's got something to do with Bran's strange powers and the coming war with the White Walkers.
Hempstead-Wright tells The Hollywood Reporter season four of the HBO series will delve deeper into his character's "mystical powers."