Task: Explanation
Input (English): William James "Bill" Pullman (born December 17, 1953) is an American actor. He made his film debut in the 1986 film "Ruthless People", and has since gone on to star in other films, such as "Spaceballs" (1987), "The Accidental Tourist" (1988), "While You Were Sleeping" (1995), "Casper" (1995), "Independence Day" (1996) and "Lost Highway" (1997). He has also appeared regularly on television, usually in films and miniseries, though he also had a starring role in the one-season show "1600 Penn". As of late summer 2017, he is in the main cast of USA Network's new eight-episode, murder-mystery limited series "The Sinner". Question: American Ultra starred which Ruthless People actor? Answer: William James "Bill" Pullman
Output (English):  He made his film debut in the 1986 film Ruthless People, and has since gone on to star in other films, such as Spaceballs 1987, The Accidental Tourist 1988, While You Were Sleeping 1995, Casper 1995, Independence Day 1996 and Lost Highway 1997.