Earth, originally known as Unicron, is a planet introduced in the 2007 Transformers movie. Throughout history, Earth has attracted many inhabitants of the planet Cybertron, this is because Earth is in fact Unicron, the enemy planet of Cybertron.
Within his crust, Unicron's horns were arranged in a hexagonal pattern with his mouth at the centre.
The Seven Primes arrived on Earth to build a Star Harvester, however as Earth already had life (primitive Humans), they decided it should've been sparred. One of their members, Megatronus Prime, however disagreed and turned on his brothers, leading to his name, The Fallen. The Primes would eventually sacrifice themselves.
Stonehenge was also built at Unicron's mouth. Together with the staff and ignition chamber, this allowed Quintessa attempt at harvesting Earth's energy in order to revive Cybertron.
The Dark Ages
Second World War
Unicron's horns had risen above the crust. Due to plate tectonics, the original hexagonal arrangement of the horns was lost into randomness, baffling scientists worldwide. It took Seymour Simmons's knowledge of a book in the Library of Trinity College Dublin for Sir Edmund to figure out Earth was Unicron all along and that the strange shape he had seen among many artefacts was in fact Pangaea. This allowed him to find out where the Decepticons would be next; Stonehenge, which was once Unicron's mouth. As Cybertron absorbed Earth's energy, it dragged its massive components across Earth's surface, literally scraping away cities. After Viviane Wembly took back the staff and ended the incident, Quintessa (disguised as a human) travelled the Egyptian desert to one of Unicron's horns. There, she tells the team of scientists there not touch it, as it would incur his wrath
The location of the Solar Harvester, as well as one of Unicron's horns.
The location of Unicron's mouth.
Notes & Trivia