 " Greatest Hits " is the 21st episode of the third season of Lost and 70th episode of the series . It was written by co @-@ executive producers Edward Kitsis and Adam Horowitz and directed by supervising producer Stephen Williams . The episode first aired on May 16 , 2007 , on ABC in the United States and on CTV in Canada . " Greatest Hits " was viewed by 12 million Americans and was well received by critics . Lost 's editors received a Golden Reel Award nomination . 
