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Sonic News Network
Sonic News Network

The Fourth Great Civilization[2] is a group mentioned in the Sonic the Hedgehog series. It was an ancient culture notable for having developed the Gizoid.


Though not much is known about the Fourth Great Civilization's culture, it has been hinted that they possessed deep knowledge of robotics and the Chaos Emeralds.[2]



The Fourth Great Civilization existed more than four millenia before the present day.[1] Back then, they were able to harness the energy of the Chaos Emeralds and use it to build the Gizoid, an advanced robot who could absorb the power of weaponry and combat. However, the Gizoid eventually accumulated so much power that it destroyed the Fourth Great Civilization, while the robot itself vanished at a later point.[2][3]


Eventually, the Fourth Great Civilization's Gizoid was uncovered in modern times in ancient ruins and left in a warehouse, where it would be discovered more than fifty years ago by Gerald Robotnik.[2] Discovering how dangerous the robot was, the professor researched for a way to keep it under control.[3] He would also try to give it to the government of the United Federation as a bribe in order to get more time for Project Shadow when they threatened to freeze the project.[4][5] However, the Gizoid would go out of control, destroying a part of the Space Colony ARK before it was subdued. Unable to destroy its core to shut it down, Gerald programmed it to have a free will so it could choose to not become a weapon of mass destruction.[6] Later, after G.U.N. raided the ARK, the Gizoid got sealed by the government.[7]

Sonic Battle

In Sonic Battle, the Gizoid was discovered once again, this time by Dr. Eggman, who sought to use it to conquer the world. However, when the robot refused to listen to him, the doctor scrapped him. After being found by Sonic and his friends, the Gizoid, which was named "Emerl", made a special bond with them. However, Emerl eventually went out of control, prompting Sonic to fight him. Regaining its senses though, Emerl activated Gerald's final program, which dictated that it should auto-destroy if it went out of control, causing him to vanish.

Sonic Advance 3

In Sonic Advance 3, using Emerl's data, Dr. Eggman built Gemerl as a spiritual successor. However, this new robot turned up against him, prompting the doctor to defeat it with the help of Super Sonic. Later, Gemerl was discovered by Cream, who had Tails fix him and reprogram him into a kind robot. Afterwards, Gemerl would live with Cream and her family.

Other game appearances

Sonic Chronicles: The Dark Brotherhood

Main article: Nocturnus Clan

Various Nocturnus Clan warriors, from Sonic Chronicles: The Dark Brotherhood.

In Sonic Chronicles: The Dark Brotherhood, the Fourth Great Civilization was mainly known as the Nocturnus Clan (ノクターン一族 Nokutān Ichizoku?). Millenia ago, they were an echidna empire and the rivals of the Knuckles Clan. However, after the Knuckles Clan was wiped out by Chaos, the Nocturnus Clan was somehow banished to the Twilight Cage after a mysterious occurence known as the Argus Event. They would live in the Twilight Cage for the next four thousand years, where they would receive the alliance of the local communities.

At the present day, the Nocturnus Clan was able to travel back to earth through the use of phase-shifting technology. However, the clan would be defeated by Sonic and his friends when they travelled to the Twilight Cage.


  1. 1.0 1.1 Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Area/Level: Gimme Shelter (Shadow's Episode). "Rouge: You'll never change, will you? That robot... Gizoid is known as the "Ultimate life form." Just like you, except he's 4000 years older. I heard the Doctor was hiding something really big, and I guess this is it..."
  2. 2.0 2.1 2.2 2.3 Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Area/Level: Ending sequence (Sonic's Episode). "Prof. Gerald's Journal 1: I have uncovered a most interesting specimen from the warehouse. I believe it to be some sort of puppet or robot made by an ancient people. At first, I didn't think anything of it, but when I was experimenting on "Chaos Emeralds," it began to move. This suggests the possibility that even the ancient civilizations could harness the power of the "Chaos Emeralds." When I was researching various papers related to the "Chaos Emeralds" and this robot, I discovered that there was a possibility that this robot was something incredible. I don't want to get ahead of myself, but this robot may be the cause of the destruction of the Fourth Great Civilization. I'm not sure I believe it just yet, though."
  3. 3.0 3.1 Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Area/Level: Ending sequence (Tails' Episode). "Prof. Gerald's Journal 2: I am no longer able to ignore the possibility that this robot did in fact destroy the Fourth Great Civilization. I have discovered a stone tablet that explains as much. According to the tablet, "When the figure falls from the heavens, and the Stone of the Gods is joined, all that exists will become one again." Though it is difficult to believe, this robot has been watching my movements, and mimicking all that I do. I was amazed by my scans of this being. Surprisingly, reams and reams of data scrolled and caused my most powerful computer to crash. More intriguing was that the data was all about melee combat and weapons of that age. Eventually, if this being is ever restored to its former state, it will put all that data to use, and recreate all the weaponry and combat abilities that it once had… And that's not all. If my guesses are correct, it will also have the ability to absorb modern weaponry as well. What have I done? I have uncovered a horrible weapon…"
  4. Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Area/Level: Ending sequence (Knuckles' Episode). "Prof. Gerald's Journal 4: The upper echelon is going crazy. Perhaps, they aim to freeze Project "Shadow". Soon, the ultimate life form, "Shadow" will be completed… The application to my granddaughter is also imminent. I cannot just let them stop my study at this point. Because I am the only one who can save my granddaughter's life."
  5. Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Area/Level: Ending sequence (Amy's Episode). "Prof. Gerald's Journal 5: The higher ups are threatening to shut down this research facility. I had no choice but to hand them the Gizoid to buy more time for my research. I tried to be careful and commanded it to never absorb any dangerous technologies. However, I have heard that other researchers have been making the Gizoid absorb weapons. Apparently, the way to cause the Gizoid to form a new "Link" is to show it power that surpasses that of its former master. While this poses immense danger, I cannot risk losing Maria."
  6. Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Area/Level: Ending sequence (Cream's Episode). "Prof. Gerald's Journal 6: My worst fears have come true. The Gizoid has absorbed enough weaponry and technology that it has started to go out of control. The resulting rampage resulted in the destruction of most of the "Ark." … I have deciphered the rest of the stone tablet. It says, "When the Gizoid had learned all that it could, it became a god of wrath, and all was destroyed." The researchers somehow managed to subdue the Gizoid and sealed it away. Luckily, it only had one "Chaos Emerald" installed. If it were to have all 7 Emeralds installed, it might destroy the whole planet. The Gizoid is too much of a liability. I tried destroying its core, but nothing I did worked. I understand too little of the technology that built him. My best hope is to try and reprogram its AI into a free-willed, emotions-based AI…"
  7. Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Area/Level: Central City (Tails's Episode). "Computer: Experiments performed by Professor Gerald... Sealed by government... Disappearance..."

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