 "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 viewing numbers from 4.08 million viewers to 4.12 million. This meant that "Regeneration" was the fourth highest viewed episode of Enterprise at the time of airing in 2003.
