 The plot involves Lister's mutated pneumonia which manifests solid hallucinations.Written by Rob Grant and Doug Naylor, and directed by Ed Bye, the episode was originally going to be broadcast as the series cliffhanger but was moved down in the broadcast schedule with a new series finale taking its place.Considered to be one of the weaker efforts from the first series, the episode was re-mastered, along with the rest of the first three series, in 1998, to bring the episode up to a standard suitable for international broadcast.