Heist Nebula

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.

Nebula was eventually captured by Thanos, however, and used as a bargaining tool to convince Gamora to reveal the location of the Soul Stone. Escaping and then pursuing Thanos to Titan, Nebula learned that Thanos had killed Gamora and aided both the Guardians, Doctor Strange, Iron Man and Spider-Man during the Battle of Titan. Despite their efforts, they failed to stop Thanos from obtaining the Infinity Stones, which he then used to wipe out half the universe's population. Nebula was among those who survived but was left alone in space while departing from Titan to Earth with Stark in the Benatar until they are found by Captain Marvel, who brought the pair to the Avengers Compound in New York.