The Machine Moon Base, also known as the Machine Sky Base Mr. Billy's Wild Ride, or the Machine Palace, was the main lair of the Machine Empire, as seen in Power Rangers Zeo. After he destroyed the Moon Palace of Rita Repulsa and Lord Zedd, King Mondo had the lunar surface fortified into the Moon Base to house his many mechanical servants and war machines. Quadrafighters and Cogs were frequently seen pacing back and forth in front of the main palace, where Mondo coordinated his attacks on Earth with Queen Machina, Prince Sprocket, and their manservants, Klank and Orbus.