|“||You can't beat me. Never!||„|
|~ Xaerous Brain|
Xaerous Brain (ゼロスブレイン Zerosu Burein ) is 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.
Its one and only in-game action is to close the entrance hatch on you. Its weak spots are the structures holding it in place, although it will also self-destruct after 30 seconds. The player may also ram it by accident.
- Nemesis (ZX Spectrum)
In this port, it attacks by firing four projectiles at a time in the player's direction.
- Nemesis (Commodore 64)
As with the Spectrum version, the boss also attacks, although the projectiles he fires are reduced to two. This version also has the highest health of any boss in the game and, unlike the other variations of this boss, the weak spot in this battle is the brain itself.
Known as the "Mother Computer" in this game, the boss gains the ability to send Option Hunters at the player.
There has been speculation Xaerous Brain may be a form of Bacterian himself. Such facts as Xaerous being the first Bacterian mothership, the story of Gradius III mentioning the rebirth of Bacterian and Bacterian's speech about how he "will always be reborn" may be evidence that the Brain is Bacterian. Another fact that may create a connection between the two is that the Brain is also known as Bacterian.
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 appears in the second episode of the Salamander anime series. Unlike the game he originated from, this time he attacks.
|Stages||Volcano • Stonehenge • Moai • Reverse Volcano • Wasteland (PCE) • Tentacle • Cell • Base|
|Sub Bosses||Volcano • Zub Rush • Mother and Child • Iron Maiden • Tentacle • Electronic Cage •|
|Bosses||Big Core • Cell Nucleus • Xaerous Brain|
|Characters||James Burton (Vic Viper) • Gaudie • Venom|
|Stages||Stage 1 • Stage 2 • Stage 3 • Stage 4 • Stage 5|
|Bosses||Volcano • Iron Maiden • Big Core Duo • Zub Rush • Crawler X • Moai Orb • Re-Bone • Enigma • Electronic Cage MK2 • Xaerous Brain|
|End bosses and major enemies|
|Major Recurring Foes||Gofer • Bacterian • Dr Venom • Zelos Force (Zeros) • Lars Empire|
|Minor Enemies||Xaerous Brain • O.V.U.M. • Eleos Brain • Mother Computer Z • Guardian Core • Central Server • Genocide Core • Metal Slave • Zelos Barrier • Doom|