Ishtar

Ishtar was the Mespotamian goddess of love and war.

After Qataka came to Earth, she was found by Gilgamesh, and after reading his thoughts, proclaimed herself to be the goddess Ishtar, and attempted to mentally ensnare him. Gilgamesh rejected her advances and left her, but she was later found by Dumuzi, the high priest of Ishtar in nearby Kish. She took control of his mind and was soon virtually ruler of the city-state.

Ishtar used her slaves to begin placing copper plating around the walls of Kish. Once completed, this would have turned the city into a giant radio transmitter, thus enabling her to take control of every mind in the region and setting her on the way to taking control of Earth. Ishtar's plans were defeated by the Doctor, Ace, Gilgamesh and Utnapishtim. The survivor of Anu uploaded a computer virus into her, unaware that she had programmed a cobalt bomb to detonate upon her death, thus destroying the planet. The Doctor disarmed the bomb by linking her computer systems to the TARDIS' telepathic circuits. However, this allowed Ishtar to upload her consciousness into the TARDIS, and she tried to take control of the ship. The Doctor jettisoned Ishtar and a piece of his TARDIS into the Time Vortex, hoping to destroy her. Unfortunately, he instead created the Timewyrm.