To start rebuilding society, Simon and Farrah ask Mulligan if they can take a census. But there's one thing they didn't count on: catching feelings.

The cabinet heads to Camp David to solve issues with the UK in a good old fashioned peace summit — if they can survive homesickness and camp crushes.

An unexpected visitor hatches a plan that could destroy humankind unless Mulligan can act fast. But all of his cabinet — except Lucy — has abandoned him.