It's basically the last few hours of Hitler's life, in the bunker while the Russians advance on and through Berlin. Consequently, almost all of it is in the bunker, giving a very claustrophobic feel. Various officers try to convince Hitler to leave, others bring reports of bad news or failed tactics, and the Fuhrer screams at them, accusing them of betrayal. All this is seen through the eyes of Traudl Junge, one of the secretarial staff who worked with Hitler for his last few years. She sees him as a broken, desperately unhappy man, and feels sorry for him.
It is, unsurprisingly, bleak and scary. While Adolf shouts and blusters, Eva Braun arranges a dance with wild, mad eyes in a chilling echo of Carry On Up the Khyber, and the Goebbels arrange the massacre of their own children to save them from a world without National Socialism.
But not as funny as the Torchwood mash-up.