 Fans Christine Contilli, Elizabeth McGinnis, and Barbara Arnold coordinated with the American Red Cross, CBS, and Warner Bros for a series of charity blood drives involving 33 states, and Alex O'Loughlin became a national spokesman for the charity.The series averaged 7.57 million American viewers per episode, ranking 89 out of 281 in the 2007–08 ratings.The pilot, "No Such Thing as Vampires", finished first among total viewers and adults aged 18–49 for its night, and was seen by 8.54 million American viewers.