premise: Chadwick Boseman refused to play James Brown.
hypothesis: Chadwick Boseman . He is known for portraying Jackie Robinson in 42 ( 2013 ) , James Brown in Get on Up ( 2014 ) , and T'Challa in the Marvel Studios film Captain America : Civil War ( 2016 ) . Get on Up (film) . The film stars an ensemble cast featuring Chadwick Boseman as Brown , Nelsan Ellis as Bobby Byrd , Dan Aykroyd as Ben Bart , Viola Davis as Susie Brown , Craig Robinson as Maceo Parker and Octavia Spencer as Aunt Honey .