Nebula

Played by Karen Gillan

Nebula is Gamora's adopted sister, similarly taken and raised by Thanos, who subjected her to repeated cybernetic "upgrades" as punishment whenever she lost to Gamora in training. Left mostly machine after years of Thanos's mutilation, she eventually turned against her adoptive father, working with the Guardians of the Galaxy and the Avengers to undo the damage he caused. Read more →

First turns up in Guardians of the Galaxy.