This chapter explores the importance of the Devil in allowing witches to act on their anger and malice. It begins by revisiting the well-known trope of the malicious and vengeful English witch and, in doing so, emphasises the importance of the Devil's role in allowing witches to act on their vengeful desires. The chapter discusses anger but focus on the importance of the control of one's anger in early modern England. In exploring six cases in which the Devil appears to a potential witch specifically because of her lack of emotional control, it demonstrates the strong links between anger, lack of control, and diabolical association. The chapter also discusses how familiar spirits were portrayed in print as physical manifestations of a witch's rage, hatred and malice. It suggests that the familiar can be viewed as an external conduit for the witch's internal desires.