episodes in season two of Enterprise alone, "Stigma" and "The Crossing". The Borg make-up applied to Billingsley slowed down production, as there was discussion on set regarding how far the assimilation process on the character should progress. "Regeneration" was intended to follow up on the events depicted in film Star Trek: First Contact which features a Borg sphere being destroyed whilst in orbit of 21st century Earth. Executive producer Brannon Braga initially refused to feature the Borg in Enterprise, calling it a "cheap trick". He agreed for them to appear when the premise for "Regeneration" was suggested, saying that "it was such a great concept I couldn’t resist it". The set pieces and costumes for the Borg were reused from earlier Star Trek productions, and had not been used since the series finale of Star Trek: Voyager, "Endgame". The Borg costume worn by Friedericy had been previously used by Roxann Dawson in the episode "Unimatrix Zero". For the sequence where the Borg debris is discovered, several other pieces of sets were re-purposed to act as debris. This included part of the saucer section of the USS Enterprise (NCC-1701-E), which first appeared in First Contact. Brian Tyler produced the score for "Regeneration". Previously he produced music for the episode "Canamar". Tyler, a lifelong Star Trek fan, requested a full tour of the "Enterprise" set as a condition of his contract. He was asked to score more episodes but with limited time available, he specifically chose "Regenerations" as it was a Borg episode. Writers Judith and Garfield Reeves-Stevens pitched a story to be used for season five of Enterprise which would have followed up on the events in "Regeneration". They intended to bring actress Alice Krige back to Star Trek as a Starfleet medical technician who makes contact with the Borg seen in this episode. This was to result in the creation of the Borg Queen first seen in First Contact, which was played by Krige. Reception Ratings "Regeneration" was first shown in the United States on May 7, 2003, on UPN. It received a 2.7/4% share among adults between the ages of 18 and 49. This means that it was seen by 2.7 percent of all 18- to 49-year-olds, and 4 percent of all 18- to 49-year-olds watching television at the time of the broadcast. The ratings were the same as the previous episode, "Cogenitor", but saw an increase in overall