Given the task definition and input, reply with output. Given a passage and a question, find the answer to the question based on the passage. The answer should consist of only one word that lies in the span of only one of the sentences in the passage.

Paragraph: Karen Gillan ( born 28 November 1987 ) is a Scottish actress , director , screenwriter and model . She played the role of Amy Pond , companion to the Eleventh Doctor , in the BBC One science fiction series Doctor Who ( 2010 -- 2013 ) . She has received wide recognition for portraying Nebula in the Marvel Cinematic Universe films Guardians of the Galaxy ( 2014 ) , Guardians of the Galaxy Vol. 2 ( 2017 ) , Avengers : Infinity War ( 2018 ) , and its untitled sequel ( 2019 ) , and also played Ruby Roundhouse in the box - office hit Jumanji : Welcome to the Jungle ( 2017 ) .
Question: who does karen gillian play in the avengers
Nebula