42 was worn by Jackie Robinson.
42 is a 2013 American biographical sports film written and directed by Brian Helgeland about the racial integration of American professional baseball by player Jackie Robinson , who wore jersey number 42 through his Major League career . Jackie Robinson . MLB also adopted a new annual tradition , `` Jackie Robinson Day '' , for the first time on April 15 , 2004 , on which every player on every team wears No. 42 .