 According to the Nielsen ratings , " Hello Goodbye " was viewed by 5 @.@ 43 million viewers upon its original broadcast in the United States . This was an increase of 29 percent from the previous episode , " The Past Presents the Future " , which was watched by 4 @.@ 0 million American viewers . It earned a 1 @.@ 8 rating / 5 share in the 18 – 49 demographic . This means that it was seen by 1 @.@ 8 percent of all 18- to 49 @-@ year @-@ olds and 5 percent of all 18- to 49 @-@ year @-@ olds watching television at the time of the broadcast . " Hello Goodbye " became the highest viewed episode of the season and number one in its hour . 
