Planet Bacterian

Bacterian, also simply known as Planet Bacterian, is the home planet of the Bacterians and and their leader Bacterion.

Trivia
Each time Bacterian is destroyed, a piece of it either regenerates into a new planet Bacterian or infects a planet into a fortress as shown in the game Gradius Galaxies.
 * The strange part about Bacterian though, is the when the player entered it in Gradius III AC, some part of the planet was mechanical.
 * You may or may not notice it, but like most Fortresses, when you enter Bacterian, it may look mechanical, but when you get to the inner depths of it, it looks completely or partly organic.