Ego's Expansion


 * "I call it the "Expansion". It is my purpose, and now it is yours as well. Over thousands of years I implanted thousands of extensions of myself on thousands of worlds. I need to fulfill life's one true purpose, to grow and spread, covering all that exists until everything is... me!"
 * ―Ego to Star-Lord[src]

The Expansion was the destructive culmination of Ego the living planet's desire to discover new life and remake it in his image. The foundations for his scheme would be laid over thousands of years through planting his cells on various planets as well as fathering several children, in the hopes that at least one would inherit his Celestial genes. He would then hire Yondu of the Ravagers to kidnap his children and bring them to him. And when he found out they did not possess his gene's, they were killed. One child, Peter Quill, did possess the Celestial genes and quickly became the target of Ego. Peter was captured and forced to start the process of terraforming. This also forced the Guardians to kill Ego before he completed the process and killed millions of people.

The Living Planet
Ego the Living Planet became aware of his existence shortly after the Big Bang. He slowly mastered his powers to manipulate matter over the course of millions years to form a planet with a breathable atmosphere. However Ego felt alone and this created an intense desire to discover other life. So Ego created a human like body and spaceship to explore the galaxy. When he finally discovered other forms of intelligent life he felt disappointed, this disappointment morphed his desire to find new life into one of transforming it. He began to place his own cells on various planets and would use his Celestial powers to terraform the planets into himself. However the process required the powers of another Celestial, so he began fathering many children among various races in the hopes that at least one child would inherit his powers. He hired Yondu Udonta to kidnap said children and bring them to him in order to start his plans. It wouldn't be until Meredith Quill gave birth to his son that this part of his plan came to fruition. He could not stay for long on Earth as his smaller organic body needed to return to to his much larger body regularly or it would decompose. He did however return three times to Earth to visit Meredith as he did genuinely love her, but he killed her by cancer because he felt that she was distracting him from his true purpose. After Peter's mother died Yondu arrived to kidnap as usual but by this point he realized what was happening to the children and decided to induct Peter into the Ravagers. In the following years Ego would take in Mantis in order to sleep in between his journeys to other worlds.

Battle of Xandar
The Quest for the Orb ended with the Guardians facing off against Ronan the Accuser who had in his possession an Infinity Stone. Eyewitness accounts of the battle soon began spreading throughout the universe, especially the part of Peter Quill wielding an Infinity Stone. This news eventually reached Ego who realized that Peter had inherited his Celestial genes. The battle also resulted in raising the Guardians to galactic fame, which resulted in them landing a contract with the Sovereign in their pursuit of Nebula who had escaped the battle. They succeeded in capturing Nebula but Rocket angered the Sovereign by stealing batteries from the species, resulting in an intense space battle between the two.