Ellen E Jones and Mark Kermode look at the impact of Saturday Night Live, or SNL, as the long-running US sketch show prepares to celebrate its 50th anniversary. Just how important is SNL in the history of American comedy? And why have we never quite understood it over here?

Ellen speaks to actor and former SNL writer Paula Pell about how it felt to get a job on the show after growing up as an obsessed fan - and whether the hectic schedule of Saturday Night Live is always conducive to the best comedy. And she talks to US comedian and podcaster Ashley Ray about SNL's enduring influence on American humour, and its relevance for audiences as it enters its 50th season.

Meanwhile, Mark discusses the cinema that has emerged from the series - from big hitters like The Blues Brothers and Wayne's World to box office flops MacGruber and A Night at the Roxbury - with author and Empire magazine editor Nick de Semlyen. And he gets the inside track on working with SNL's legendary super-producer Lorne Michaels - and on bringing the music of Queen to a whole new generation - from Wayne's World's director Penelope Spheeris.

Producer: Jane Long