Byrne was the most prolific script contributor to the first season of Space: 1999 (1973–75), and was initially given the assignment of story consultant for the second season (1976–77). However, in order to make a greater impact on the American market, the producers wanted an American story consultant, and the job was given to Fred Freiberger. Byrne's scripts for Space: 1999 include "Matter of Life and Death" (based on a draft by Art Wallace), "Another Time Another Place", "Force of Life", "Voyager's Return" (based on a draft by Joe Gannon), "End of Eternity", "The Troubled Spirit", "Mission of the Darians", "The Testament of Arkadia", "The Metamorph", "The Immunity Syndrome" and "The Dorcons".
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