Supacell: Rapman's superhero series tackling knife crime and sickle cell

Getty ImagesRapman says he is "so proud of having made something so special" Heroic superheroes fighting evil and the gritty streets of south London aren't two worlds that would usually collide, but for Rapman it was a match made in heaven. The 35-year-old rapper and director has created a new Netflix sci-fi series about five black south Londoners who unexpectedly gain superpowers. At the London premiere, Rapman,…