|Other Name(s)||Final Enemy, Mother Computer, Bio Computer, Cyber Brain, Bacterion|
|Appears In||Gradius, Parodius Da! (Parody), Gradius Rebirth|
The controlling entity inside the mothership of the invading forces, and final boss of the original Gradius. It is referred to as the mother computer in Gradius Rebirth. A parody of this boss was later used in Parodius Da!.
Its weak spot is the structures holding the Brain in place.
It's one and only in-game action is to close the entrance hatch on you. It self destructs in 30 seconds if that counts. The player might also ram the thing by accident.
- Gradius Rebirth:
It gained the new ability to send Option Hunters at you. And not much else.
- Nemesis ZX Spectrum Port:
It now shoots at you. That may need a second to sink in.
The final boss actually attacks in the Spectrum port.
- Commodore 64 Port:
As with the Spectrum version, this boss now fires two bullets a time in your direction.
This version also has the highest health of any boss in the game.
Unlike other variations of this boss - the weakspot in this battle is the brain itself.
Xaerous Brain an unevolved Bacterion? Edit
There has been speculation Xaerous Brain may be a form of Bacterion himself. Such facts as Xaerous being the first Bacterian mothership, the story of Gradius III mentioning the rebirth of Bacterian and Bacterion's speech in Gradius III about how he "will always be reborn" may be evidence that the Brain is Bacterion. Another fact that may create a connection between the two is that the Brain is also known as Bacterion.
This "boss" established the series long running in-joke of having the final enemy be an absolute pushover. In this case, it does not attack at all.
Xaerous Brain appear in the Salamander second series. But unlike the game he originated from, he attacks.
|Sub Bosses||Volcano • Zub Rush • Mother and Child • Iron Maiden • Tentacle Golem • Electronic Cage|
|Bosses||Big Core • Cell Nucleus • Brain|
|Parodius Da! Bosses|
|Sub-Bosses||Cat Battleship • Chichibinta Rika • Karakasa • Shower Cage • Moai Pirate (NES) • Pinwall (GB)|
|Bosses (Standard)||Nohusuki III • Eagle Sabu • Hot Lips • Buta Shio • Yoshio • Viva Core • Honey • Puuyan • Yoshiwara Dayuu • Golgado Tako |
|Port Exclusive||Duck Captain • Toka Furo • Penguin Bomb • Brain Freeze • Conducter |
|End Bosses & Major Enemies|
|Major Recurring Foes||Gofer • Bacterion • Dr Venom • Zelos Force (Zeros) • Lars Empire • Gofer Sisters|
|Minor Enemies||Brain • O.V.U.M. • Eleos Brain • Mother Computer Z • Guardian Core • Central Server • Genocide Core • Outer Limits / Metal Slave • Zelos Barrier • Doom • Dark Force|