Delphi (Beautiful Chaos)

Madam Delphi was a Mandragora who wanted to take over the human race. She wanted the human race to save the Mandragora from dying forever. She also wanted revenge on the Doctor and would use her power over Earth to gain that revenge.

Madam Delphi had the power to take over many people including Wilfred Mott's friend Netty. The Doctor, Wilf and Donna then began batteling Madam Delphi who was about to launch her plan to distroy Earth. This was foiled by The Doctor who used Nettys mind to trick Madam Delphi sending her and the other Mandragora back into space. (NSA: Beautiful Chaos)