 In its original American broadcast on 12 April 2005, "The Alliance" was viewed by an estimated 5.4 million viewers and received a 2.4/6% rating share among adults between the ages of 18 and 49.This means that it was seen by 2.4% of all 18–49 year-olds, and 6% of all 18–49 year-olds watching television at the time of the broadcast.The episode, airing after "Scrubs", retained 100% of its lead-in 18–49 audience for the second week in a row.