The Moon has played a pivotal role in several other adventures. In Tooth and Claw we witnessed how the effects of a full moon turned a mad man into a bad wolf. The Doctor ultimately defeated the werewolf using a highly concentrated shaft of light from the moon, rendering the lycanthrope seemingly human again before freeing him from his curse.
In Doctor Who and the Silurians it emerged that an intelligent reptilian species had ruled Earth long before humanity achieved dominance. However, this race, known as the Silurians, opted to go into subterranean hibernation when the Moon first approached the planet, fearing the satellite would smash into their world and create carnage. But there was no collision and by the time they woke up, homo sapiens were no longer semi-evolve simians and their war with man began.
Over the decades the Cybermen have proven the Doctor's most moonstruck adversaries. They used the dark side of the Moon to cloak their presence in both The Invasion and Attack of the Cybermen and in Silver Nemesis they orbited the satellite whilst waiting for their Cyber Leader.
Even when the Doctor isn't around the Moon remains a potential source of Armageddon. In The Lost Boy, one of The Sarah Jane Adventures, there was more lunacy when the Xylok attempted to smash the Moon into Earth. The genocidal scheme was foiled by Sarah Jane and K-9 and the satellite returned to its customary orbit.
But it seems inevitable that the Doctor will see more trouble from the silvery sphere in our night-time sky. By the time of the Fourth Great and Bountiful Human Empire, the Doctor himself declared that Earth has five moons! And that's a lot of dark sides for a lot of invasion fleets...
