Nebula is a former Luphomoid assassin, an adopted daughter of the intergalactic warlord Thanos and adopted sister of Gamora. As the right-hand woman of Ronan the Accuser during his and Thanos' quest to retrieve the Orb, she helped him fight the Guardians of the Galaxy during the Battle of Xandar. Fleeing the battle after a fight with Gamora, Nebula was soon captured by the Sovereign and handed back to the Guardians after a finished commission. She escaped and helped Taserface lead the other Ravagers in a mutiny against their former leader Yondu Udonta before leaving to find and kill Gamora. After forgiving and helping her sister alongside the Guardians during the Battle on Ego's Planet, she left in a ship to pursue a revenge mission against Thanos.