Katherine and Silas

The relationship between Katherine Pierce and Silas.

Katherine's the one that freed Silas from his tomb, but they will not meet until season Five.

Season Four
Katherine fed Jeremy's blood to Silas, thus awakening him and fleeing with the cure.

Season Five
Katherine and Silas first meet when Katherine is taking a bath and he walks in on her.

Trivia

 * They both have dopplegangers, Elena and Stefan.
 * They will both most likely want revenge on Elena.
 * Katherine will want revenge on Elena for making her humanity by the cure;
 * Silas will most likely want revenge on Elena for using the cure on someone else when he wanted it. He might find a way to use Katherine's blood as the cure.
 * Silas wanted the cure. Katherine didn't, but she was the one to take it.