In the episode, a parasitic alien called Adam Smith (Bryan Dick) arrives in Cardiff and adds false memories of himself into the minds of the alien-hunting team Torchwood.

The pair search Torchwood's files, discovering the truth after seeing footage of Adam implanting the memories into Ianto.

Jack discovers that the team needs to take amnesia pills, to erase their memories of the past forty-eight hours.

As they fall asleep, Jack returns to the cells to find Adam disappearing as a result of the memory erasure.

In John Barrowman's autobiography, he mentions that, during filming of this episode, the kiss between Ianto and Jack continued for more than two minutes before the two of them realised that the crew had intentionally not called 'Cut' as a prank.