Lady Peinforte

A seventeenth century noblewoman who sought the power of the Nemesis statue. She had made the sculpture from the Gallifreyan substance Validium and doing so, learned much about the Doctor. She becomes aware no only of his alien heritage but a great deal more besides. However, the Doctor sent the statue into deep space to protect his secrets. Peiforte time traveled to the twentieth century, knowing exactly when it was due to return. She battled the Cybermen and neo-Nazis for control of the Nemesis, finally allowing her physical body o emerge with the statue, which absorbed her completely. The statue, now resembling Lady Peinforte, launched itself into space, wiping out the Cybermen completely.

Lady Peinforte was only in Silver Nemesis.