Sun Set is a box set of various Klaatu rarities, outtakes, demos, live tracks and other recordings from 1973 to 1981. It was launched at the "KlaatuKon" 2005 convention in Toronto, Canada, receiving high praise from Klaatu fans around the world. What some considered as the highlights of the compilation were the final nine tracks on disc one, which composed alternate versions of the entirety of Klaatu's second album, Hope. Referred to as "The Orchestral Hope" or "The Alterna-Hope", this included a track not present on the version of Hope which was originally released; "Epilogue," which joined "So Said the Lighthouse Keeper" and "Hope".

Klaatu gained international attention by remaining hidden for two albums, the first of which was rumoured to be a hidden Beatles reunion album. Their first album 3:47 EST ("Klaatu")indeed was superb enough to qualify as a Beatles album, with some very skilful songwriting, excellent production and splendid execution. One could fault their inspiration, since they are definitely Beatles-esque, but they manage this better than any other group ever had or has since this album. By the time their stunning follow-up album Hope was released, it was clear they were not the Beatles, but nevertheless the songwriting, execution and inspiration remained flawless.

Klaatu gained international attention by remaining hidden for two albums, the first of which was rumoured to be a hidden Beatles reunion album. Their first album 3:47 EST indeed was superb enough to qualify as a Beatles album, with some very skilful songwriting, excellent production and splendid execution. One could fault their inspiration, since they are definitely Beatles-esque, but they manage this better than any other group ever had or has since this album. By the time their stunning follow-up album Hope was released, it was clear they were not the Beatles, but nevertheless the songwriting, execution and inspiration remained flawless…