The Villains
After breaking away from the United Alliance of Evil, the Machine Empire arrived to conquer Earth, the final link in a series of conquered planets. The Machine Empire later rejoined the Alliance, only to be destroyed by Zordon's energy wave in Power Rangers in Space.
Once Rita and Zedd were driven away (they remained on the moon, driving around in an RV potting the Machine Epire's downfall), the Machine Empire set up their base on the moon. Their stronghold housed Sky Fortresses, Quadra Fighters, and several Cogs. The unused Machine facilites remain on the moon.
Once Rita and Zedd were driven away (they remained on the moon, driving around in an RV potting the Machine Epire's downfall), the Machine Empire set up their base on the moon. Their stronghold housed Sky Fortresses, Quadra Fighters, and several Cogs. The unused Machine facilites remain on the moon.