All of the episodes, including those completed after Adams's death, are referred to as "Fits" after Lewis Carroll's "The Hunting of the Snark: an Agony in Eight Fits". In 1981, upon a rebroadcast of the twelve episodes of the first two series, it was decided that the Christmas episode, which previously had no episode number, would be called "Fit the Seventh" and the episodes in the second series, which had first been billed as Fit the First to Fit the Fifth (representing five parts of the second series) would become Fit the Eighth to Fit the Twelfth.