Moonbase Two
From MediaWiki

Alongside Moonbase One, Moonbase Two is an Autobot base on one of Cybertron's moons. It appears to be smaller and less extensive than Moonbase One.
Fiction
The Transformers cartoon
Spike Witwicky and Bumblebee were stationed on Moonbase Two until Unicron attacked it after gobbling up Moonbase One. Spike and Bumblebee set the entire moon to self-destruct in Unicron's mouth in an attempt to destroy the planet eater, but he didn't even bat an eyebrow. The Transformers: The Movie
Animated
Moon Base Two is Cybertron's outer, smaller moon. It serves as an impressive communications and computer facility. The AllSpark Almanac II
Exodus: The Official History of the War for Cybertron
Moonbase Two orbits Cybertron. Exodus: The Official History of the War for Cybertron
Notes
- Cybertron's two moons were first shown in the movie.[Confirmation requested.] They might have been there all along, but they were not seen, even when Cybertron was pulled into Earth orbit in The Ultimate Doom.

