Your TV Source Roundup: ‘The Diplomat’ Premiere Date, ‘The Drop: A Snowfall Saga’ Trailer, ‘A Different World’ Trailer, ‘The Traitors: New Blood’ Trailer, ‘Hollywood Arts’ Premiere Date, ‘It: Welcome to Derry’ Renewed, and More!

Season four of The Diplomat premieres October 15 on Netflix. two marriages threaten to eat each other alive. One catastrophic moment shatters the fragile peace Kate Wyler brokered between the US and UK, as well as the crumbling marriage she’s trying to save. While she fights to stem the bleeding, President Grace Penn and VP Hal Wyler’s conspiracy to steal Russia’s most powerful weapon hurtles the…