Question: Guardians of the galaxy cast gamora's sister?

Disambiguated questions and answers:
context: Ronan meets with Gamora's adoptive father, Thanos, to discuss her betrayal. Quill's group flee to Knowhere, a remote lawless outpost in space built in the giant severed head of a Celestial. A drunken Drax summons Ronan while the rest of the group meet Tivan. Tivan opens the orb, revealing the Power Infinity Stone, an item of immeasurable power that destroys all but the most powerful beings who wield it. Tivan's slave Carina grabs the Stone, triggering an explosion that engulfs Tivan's archive. Ronan arrives and easily defeats Drax, while the others flee by ship, pursued by Ronan's followers and Gamora's adoptive sister Nebula. Nebula destroys Gamora's ship, leaving her floating in space, and Ronan's fighters capture the orb.
question: Guardians of the galaxy cast gamora's sister character?
short_answers: Nebula
wikipage: Guardians of the Galaxy (film)

context: In early April 2013, Zoe Saldana entered into negotiations to star as Gamora in the film, and it was confirmed she had been cast later that month. Also in April, Michael Rooker joined the film's cast as Yondu, and it was announced that Ophelia Lovibond had been cast in a supporting role. By this point in time, Lee Pace was in final negotiations to play the villain of the film. In May, Marvel offered John C. Reilly the role of Rhomann Dey. At the same time, it was disclosed that filmmakers were looking at actors including Hugh Laurie, Alan Rickman, and Ken Watanabe, for another role, and that Christopher Markus and Stephen McFeely were providing finishing touches to the script. A few days later, Glenn Close was cast as the head of the Nova Corps in the film, followed shortly by the casting of Karen Gillan as the film's lead female villain. By June 2013, Benicio del Toro was cast in the film, as part of a multi-film deal with Marvel Studios. Later in the month, it was confirmed that Reilly had been cast as Rhomann Dey.
question: Guardians of the galaxy cast gamora's sister character actress?
short_answers: Gillan

Karen Sheila Gillan

Karen Gillan
wikipage: Guardians of the Galaxy (film)

Long answers:
knowledge: content: Guardians of the Galaxy (retroactively referred to as Guardians of the Galaxy Vol. 1)[4][5] is a 2014 American superhero film based on the Marvel Comics superhero team of the same name.
wikipage: Guardians of the Galaxy (film)

content: Zoe Yadira Saldaña Nazario (born June 19, 1978) is an American actress.
wikipage: Zoe Saldana

content: She portrayed Gamora in the Marvel Cinematic Universe, beginning with Guardians of the Galaxy (2014).
wikipage: Zoe Saldana

content: Karen Sheila Gillan (/ˈɡɪlən/; born 28 November 1987) is a Scottish actress and filmmaker.
wikipage: Karen Gillan

content: Gillan subsequently achieved international stardom for portraying Nebula in the Marvel Cinematic Universe superhero films Guardians of the Galaxy (2014), Guardians of the Galaxy Vol. 2 (2017), Avengers: Infinity War (2018), and Avengers: Endgame (2019), which became the highest-grossing film of all time, from July 2019 to March 2021. She is set to reprise the role in the upcoming films Thor: Love and Thunder (2022) and Guardians of the Galaxy Vol. 3 (2023).
wikipage: Karen Gillan
long_answer: In the 2014 superhero film Guardians of the Galaxy, Gamora, portrayed by American actress Zoe Saldana, has an adoptive sister named Nebula, portrayed by Scottish actress and filmmaker Karen Sheila Gillan. Gillan reprised the role in 2017's Guardians of the Galaxy Vol. 2, 2018's Avengers: Infinity War, and 2019's Avengers: Endgame, which became the highest-grossing film of all time. She is set to appear as Nebula again in the films Thor: Love and Thunder in 2022 and Guardians of the Galaxy Vol. 3 in 2023.

long_answer: Gamora's sister Nebula in the Guardians of the Galaxy is played by Karen Gillan.