Juno Eclipse served as an Imperial officer and pilot during the Great Jedi Purge. Her exceptional skills in leadership and combat were noticed by several high-ranking officials in the Imperial Military, including the Sith Lord Darth Vader, who personally chose her to lead his Black Eight Squadron. Her role in the Bombing of Callos caused her to doubt some of the Empire's policies.
Eclipse was subsequently assigned to transport Darth Vader's secret apprentice, Starkiller. Forced into the life of a fugitive, she reluctantly joined him in the mission to create the Rebel Alliance.