Six of television's top drama series bosses - Sam Esmail, Julian Fellowes, Nina Jacobson, Marti Noxon, Melissa Rosenberg and John Ridley - open up about the stories that made them genuinely nervous in Hollywood and what it takes to cast their shows.

TV's top reality talent - Mark Cuban, Jane Lynch, Guy Fieri, Nick Cannon, Mike Darnell and LL Cool J - discuss on-set psychologists, coaxing contestants and America's first reality star presidential candidate, Donald Trump.