<Tr> <Td> 2014 </Td> <Td> Unity </Td> <Td> Narrator </Td> <Td> Documentary </Td> </Tr> <Tr> <Td> 2014 </Td> <Td> Infinitely Polar Bear </Td> <Td> Maggie Stuart </Td> <Td> </Td> </Tr> <Tr> <Td> 2014 </Td> <Td> Guardians of the Galaxy </Td> <Td> Gamora </Td> <Td> </Td> </Tr> <Tr> <Td> 2014 </Td> <Td> The Book of Life </Td> <Td> Maria Posada </Td> <Td> Voice role </Td> </Tr>

Who does zoe saldana play in guardians of the galaxy
find me the text answering this question