Premise: Jake Gyllenhaal . A member of the Gyllenhaal family and the son of director Stephen Gyllenhaal and screenwriter Naomi Foner , Gyllenhaal began acting as a child with a screen debut in City Slickers ( 1991 ) , followed by roles in A Dangerous Woman ( 1993 ) and Homegrown ( 1998 ) . His breakthrough performance was as Homer Hickam in October Sky ( 1999 ) and he garnered an Independent Spirit Award nomination for Best Male Lead for playing the title character in the indie cult hit Donnie Darko ( 2001 ) , in which he played a psychologically troubled teenager alongside his older sister , Maggie Gyllenhaal . Gyllenhaal received further recognition for roles in Zodiac ( 2007 ) , Brothers ( 2009 ) , Prince of Persia : The Sands of Time ( 2010 ) , Love & Other Drugs ( 2010 ) , for which he was nominated for a Golden Globe Award for Best Actor -- Motion Picture Musical or Comedy , Source Code ( 2011 ) , End of Watch ( 2012 ) , Prisoners , Enemy ( both 2013 ) , Nightcrawler ( 2014 ) , Southpaw ( 2015 ) and Nocturnal Animals ( 2016 ) .
Hypothesis: Jake Gyllenhaal is a person.
Label: ENTAILMENT