Moonbase One
Moonbase One, or Luna 1, is one of Cybertron's moons, with the others naturally being Moonbase Two, Moonbase 3, and Moon Base Four.
Fiction
The Transformers cartoon
In 2005, it was primarily an Autobot command base during fight against Decepticon-controlled Cybertron. Many Autobots were stationed on Moonbase One, including Optimus Prime, Ratchet, Ironhide, Prowl, Brawn, and the Dinobots, but only Jazz and Cliffjumper were left behind when Optimus Prime went to provide reinforcements to Autobot City, Gears was seen in the beginning when Ironhide departed but was never seen again.
Not too long afterwards, Moonbase One was targeted and devoured by Unicron. It spent a while being slowly digested within Unicron's bowels, up until he was obliterated by a mystical glowing thingy. The Transformers: The Movie
Animated
Moon Base One is Cybertron's inner moon, and serves as a major industrial center with plenty of energon farms and processing facilities. The AllSpark Almanac II
Exodus
Moon Base One was built during the Golden Age of Cybertron. It was occupied by Starscream's Seekers during the civil war, and Sentinel Prime was imprisoned there after a disagreement with Megatron after he was kidnapped and taken to Kaon. Transformers: Exodus
IDW Generation 1 comics
Luna 1, the largest of Cybertron's two moons, vanished at some point in the ancient past. The Death of Optimus Prime Legend has it that it was destroyed during the battle between the death god Mortilus and his fellow gods, the Guiding Hand. Primus: You, Me, and Other Revelations Not everyone believed this, and over the years several attempts were made to find the missing satellite: Tailgate coordinated the first unsuccessful search over six million years ago. How Ratchet Got His Hands Back At least one more "Moonquest" took place later on when Hot Rod vowed to find Luna 1, this time with Swerve partaking in it, but it apparently had the same disappointing results. Primus: You, Me, and Other Revelations How to Say Goodbye and Mean It
When Vector Sigma was reignited, Cybertron automatically began reviving its moons as well by transmitting energy to them, but the absence of Luna 1 caused its share of the energy to gather in the atmosphere instead. The atmosphere was superheated into a plasma state, causing "ball lightning" effects to strike Cybertron's surface until Wheeljack put up a temporary satellite to draw the energy away. Stick Together
Notes
- Cybertron's two (or three, or four) moons were first shown in the movie. At no point were any Cybertronian satellites seen in the first two seasons of the cartoon, making their presence in the movie a bit of a mystery. However, a "drunken" Megatron does refer to Cybertron as 'the land of the metal moon' in "Microbots".
- It may or may not be the same thing as Moon Alpha, which originated in the Dreamwave Generation One continuity.