4x03
I think Jonathan Hyde is doing amazing as The Master.
And I know I'll be in the minority, but I felt Zach was the most bearable tonight he's ever been. He got to have a bit more range, that I don't think the first kid would've pulled off. Mainly emo. But it worked. More the actor than the character. Abby though, girl is doomed. Once they see her as a threat to his dark potential, I bet they'll make him kill her.