Bel-Air is a reboot with its own remarkable origin story. In 2019, the independent film-maker Morgan Cooper had the audacity to make a trailer for an imaginary new version of The Fresh Prince of Bel-Air, reshaping the 1990s sitcom as a tough, Ryan Coogler-style drama. Cooper might have dreamed that the clip would go viral and that the show would actually be made, with him still on board directing...