Question: Bob Gale co-wrote the sci-fi film directed by whom?

Context paragraphs:
1941 (film): 1941 is a 1979 American period comedy film directed by Steven Spielberg, written by Robert Zemeckis and Bob Gale, and featuring an ensemble cast including Dan Aykroyd, Ned Beatty, John Belushi, John Candy, Christopher Lee, Toshiro Mifune, and Robert Stack.  The story involves a panic in the Los Angeles area after the December 1941 attack on Pearl Harbor.

Back to the Future: Back to the Future is a 1985 American science-fiction adventure comedy film directed by Robert Zemeckis and written by Zemeckis and Bob Gale.  It stars Michael J. Fox as teenager Marty McFly, who is sent back in time to 1955, where he meets his future parents in high school and accidentally becomes his mother's romantic interest.  Christopher Lloyd portrays the eccentric scientist Dr. Emmett "Doc" Brown, Marty's friend who helps him repair the damage to history by helping Marty cause his parents to fall in love.  Marty and Doc must also find a way to return Marty to 1985.

Bob Gale: Michael Robert Gale (born May 25, 1951) is an American screenwriter, producer and film director.  He famously co-wrote the science fiction film "Back to the Future" with writing partner Robert Zemeckis, and the screenplays for the film's two sequels.  Gale also co-produced all three films, and served as associate producer on the subsequent animated TV series.

Back to the Future (franchise): The "Back to the Future" franchise is an American science fiction–comedy film series written and directed by Robert Zemeckis, produced by Bob Gale and Neil Canton for Steven Spielberg's Amblin Entertainment, and distributed by Universal Pictures.  The franchise follows the adventures of a high school student, Marty McFly (Michael J. Fox), and an eccentric scientist, Dr. Emmett L. Brown (Christopher Lloyd), as they use a DeLorean time machine to time travel to different periods in the history of Hill Valley, California.

Back to the Future Part II: Back to the Future Part II is a 1989 American science-fiction adventure comedy film directed by Robert Zemeckis and written by Bob Gale.  It is the sequel to the 1985 film "Back to the Future" and the second installment in the "Back to the Future" trilogy.  The film stars Michael J. Fox, Christopher Lloyd, Thomas F. Wilson, and Lea Thompson and continues immediately following the original film.  After repairing the damage to history done by his previous time travel adventures, Marty McFly (Fox) and his friend Dr. Emmett "Doc" Brown (Lloyd) travel to 2015 to prevent McFly's future son from ending up imprisoned.  However, their presence allows Biff Tannen (Wilson) to steal Doc's DeLorean time machine and travel to 1955, where he alters history by making his younger self wealthy.

Alfonso Brescia: Alfonso Brescia (6 January 1930 – 6 June 2001) was an Italian film director of low-budget films, sometimes credited as Al Bradley or Al Bradly.  Film buffs mainly know him for the four low-budget sci-fi films he hurriedly directed in 1978 to capitalize on the success of "Star Wars"...Cosmos War of the Planets", "Battle in Interstellar Space", "War of the Robots and Star Odyssey.  (His movie The Beast in Space (1980) was an adult sci-fi film, and was not part of his 1978 space series).  Horror film fans know him for his 1972 giallo Naked Girl Killed in the Park.

Mr. Payback: An Interactive Movie: Mr. Payback: An Interactive Movie is a 1995 American science-fiction/adventure short film written by Bob Gale and co-directed by Gale and Charles Croughwell.  Designed as an interactive movie, it comprises slightly over two hours of footage, approximately 20 minutes of which is seen in each viewing.  It requires the audience to vote for various directions the story will take, using a joystick attached to the armrests of their seats.  The film stars an android (Billy Warlock) who, in a number of possible storylines, takes action by humiliating or attacking people who deserve it.  Gale and Christopher Lloyd, who had previously worked on the "Back to the Future" trilogy, worked on this film as well, and the music was scored by Michael Tavera, who had composed the music for the animated "Back to the Future" series.

Jerome Bixby: Drexel Jerome Lewis Bixby (January 11, 1923 – April 28, 1998) was an American short story writer and scriptwriter.  He wrote the 1953 story "It's a Good Life" which was the basis for a 1961 episode of "The Twilight Zone" and which was included in "" (1983).  He also wrote four episodes for the "" series: "", "Day of the Dove", "Requiem for Methuselah", and "By Any Other Name".  With Otto Klement, he co-wrote the story upon which the sci-fi movie "Fantastic Voyage" (1966), television series, and novel by Isaac Asimov were based.  Bixby's final work was the screenplay for the 2007 sci-fi film "The Man From Earth".

I Wanna Hold Your Hand (film): I Wanna Hold Your Hand is a 1978 American comedy film directed and co-written by Robert Zemeckis, which takes its name from the 1963 song "I Want to Hold Your Hand" by the Beatles.  It was produced and co-written by Bob Gale.

Used Cars: Used Cars is a 1980 American satirical comedy film, co-written by Robert Zemeckis and Bob Gale, and directed by Zemeckis.  Rudy Russo (Kurt Russell) is a devious car salesman working for affable but monumentally unsuccessful used car dealer Luke Fuchs (Jack Warden).  Luke's principal rival, located directly across the street, is his more prosperous brother, Roy L. Fuchs (also played by Warden), who is scheming to take over Luke's lot.  The film also stars Deborah Harmon and Gerrit Graham, and the supporting cast includes Frank McRae, David L. Lander, Michael McKean, Al Lewis, Dub Taylor, Harry Northup, Dick Miller, and Sarah Wills.

Supporting paragraphs: Bob Gale Back to the Future
Answer: Robert Zemeckis