 " Underneath " first aired in the United States on March 31 , 2002 on the Fox network . The episode later debuted in the United Kingdom on February 2 , 2003 on BBC One . The episode earned a Nielsen household rating of 4 @.@ 4 , meaning that it was seen by 4 @.@ 4 % of the nation 's estimated households and was viewed by 4 @.@ 64 million households and over 7 @.@ 3 million viewers . " Underneath " was the <unk> most watched episode of television that aired during the week ending March 31 . 
