Angel Island (Sonic X)

Angel Island (エンジェルアイランド) is a location that appears in the anime series Sonic X and its comic series published by Archie Comics. It is an island from Sonic's world that floats through the skies, suspended by the mystical powers of the Master Emerald. It is also the location of its world's Planet Egg. The island is the ancestral home of the Knuckles Clan who has protected its magical gemstone for generations, its current guardian being Knuckles the Echidna, the last known survivor of the Echidna race.

Due to Chaos Control, Angel Island was sent to Earth for a while before being returned to its home world. Following the Metarex wars, the island was left grounded until the Master Emerald could recover from recent usages.

Past
Angel Island came into being generations ago, where it was a part of the Mystic Ruins. When the ancient Knuckles Clan, an echidna clan led by Pachacamac yearned for the Master Emerald and Chaos Emeralds, which rested at a shrine on the outskirts of their settlement, he planned to seize the Emeralds to obtain ultimate power for his clan. When this time came, Pachamac's daughter, Tikal, stood between them, and begged her people to leave the Emeralds and the peaceful colony of Chao that resided there. When the clan continued onward regardless, this angered the Emeralds' guardian, Chaos, who appeared and wiped out the echidnas as Perfect Chaos. Tikal prayed to the Master Emerald to calm Chaos down when its rage became uncontrollable. In response, the gem absorbed both of them into itself. In the aftermath, a large fragment of the surrounding land had broken off and floated into the sky, becoming Angel Island. The remaining Knuckles Clan members would then take residence there to protect the Master Emerald. Generations later, the only echidna left on Angel Island to uphold this duty would be Knuckles the Echidna.

Chaos Emerald Saga
Angel Island was eventually left unoccupied when Knuckles got sent to Earth by Chaos Control. While traveling the Earth, Knuckles desperately searched for a way to get back to Angel Island and his duty. As fate would have it, Angel Island was later transported to Earth, along with the Master Emerald, by a massive Chaos Control caused by a fight between Super Sonic and the E-99 Eggsterminator.

Chaos Saga
With Angel Island now on Earth, Knuckles returned there to continue his mission to protect the Master Emerald. Six months after its arrival on Earth however, Angel Island fell into the sea near Mystic Ruins when Dr. Eggman shattered the Master Emerald in order to release Chaos from within it. With the Master Emerald's fragments scattered across everywhere, Knuckles was forced to leave the island in order to recover them. During this time, Angel Island was made off-limit to the general public. Knuckles eventually succeeded with his mission and Angel Island returned to the skies.

Shadow Saga
A shot while afterwards, Rogue and Topaz came to Angel Island to acquire Master Emerald to use it as bait for Dr. Eggman. Despite Knuckles' attempts, the pair got away with both the Master Emerald and a Chaos Emerald that had landed on the island. Knuckles would eventually reclaim the Master Emerald and get it back to Angel Island.

Homebound Saga
When it was revealed that the presence from everything from Sonic's world was threatening to freeze time, Angel Island and all else not native to Earth were sent back to their world using a machine Tails and Chuck Thorndyke created.

Metarex Saga
Six months after returning home, Angel Island came under attack by the Metarex Carrer, an emissary of the Metarex seeking the Planet Egg, the life source of Sonic's planet, on the island. Despite their efforts, Sonic, Knuckles and their allies were unable to stop the Metarex Carrer from taking the Planet Egg. Soon after, Chris arrive from Earth through the Master Emerald and met his friends upon his arrival. Seeking to take the fight to the Metarex, Sonic and his allies took the Master Emerald to use it as a power source for the Blue Typhoon, making Angel Island fall into the ocean. After reclaiming their Planet Egg and stopping the Metarex however, Angel Island was unable to return to the sky as the Master Emerald's power had been used up. As such, Knuckles would watch over its shards on the island until its power would return.