After Thanos apparently killed the Elders of the Universe, to impose his total supremacy, he became one with the Cosmic Cube and killed the Avengers and the Guardians as well. But actually, they were sent to the Cancerverse along the Elders, there, Tony Stark found that Thanos' weapon wasn't actually a Cosmic Cube and that it had own defects. They bargained with the Collector, in exchange of a weapon capable of deactivating the "Cube" and return to Earth, the Avengers and the Guardians would let Thanos to be defeated by the Elders. With the help of other members of the Avengers, Thanos was defeated and sent to punishment by the Elders.
Due to his enormous help with the defeat of Thanos, Starlord personally offered Iron Man a spot in his team, which he gladly accepted. J'son of Spartax alerted Star-Lord, his son, that a council of galactic empires decided that Earth should be left untouched, and tasked him to protect it along the Guardians.
Members:
Star-Lord
Drax the Destroyer
Gamora
Rocket Raccoon
Groot
Captain Marvel
Agent Venom
Supporting Cast:
J'son
Allies:
Angela
Former Members:
Iron Man
Villains:
Thanos the Mad Titan
Villainous Groups:
Badoon