The Battle on Sovereign was an open confrontation between the Guardians of the Galaxy, who had been hired by the Sovereign's High Priestess Ayesha, and the Abilisk.

Background

Sometime after being hailed as heroes for helping defeat Ronan the Accuser and saving the planet Xandar, the Guardians of the Galaxy were hired by Ayesha, the High Priestess of the Sovereign, to defeat the Abilisk, a beast who was slowly devouring her home planet's power source.

In exchange, Ayesha promised to release Gamora's sister Nebula, whom the Sovereign had arrested following the Battle of Xandar, into their custody.