Zeus

Zeus was an Olympian and as well leader of his race.

Biography
After the Olympian Prometheus stole some life spores and spread it across the galaxy to create life, Zeus became mad and banished him to an unknown planet to be chained to a mountain for the rest of his exsistence. Zeus believed that the life spores should only be used once they could produce peace loving creatures. (DWM: The Life Bringer)

Arrival of the Doctor
Once Prometheus returned with the Doctor and K9 to the planet Olympus, Zeus sent Aphrodite to pick them up and bring them to him. Once there, Prometheus tried to reason with Zeus that the people were good but Zeus mentioned that most of them knew how to hate, steal, kill and start wars to which they've poisoned the universe with their actions. He had Prometheus sent to the confinement rooms whilst the Doctor and K9 sent to Asclepius to be studied on.

However after the Doctor, K9 and Prometheus escaped, Zeus showed his wrath by appearing in a gigantic form in the clouds. He then sought to stop them by attacking them with massive amounts of electricity however once they got into the TARDIS, Zeus wasn't able to destroy the ship with his powers. (DWM: The Life Bringer)