She is one of Craster's daughters whom he has married.
After Craster is killed in the mutiny, she is taken by Karl Tanner, who frequently beats her. When Morag brings in Craster's last son, she joins her sisters in chanting that the child is a gift for the gods.
|Season Four appearances|
|Two Swords||The Lion and the Rose||Breaker of Chains||Oathkeeper||First of His Name|
|The Laws of Gods and Men||Mockingbird||The Mountain and the Viper||The Watchers on the Wall||The Children|
Behind the scenes
The character's name is never mentioned onscreen or in credits. It is mentioned in the actress's CV.
In the books
In the A Song of Ice and Fire novels, there's no mention of a daughter-wife of Craster called Sissy.