Series 1, Episode 23
There's a big surprise as Danielle wanders onto the beach to warn the survivors that they will soon be visited by 'the others'. She leads Jack, Hurley, Kate and Locke into the jungle, where they finally get to see the Black Rock - which turns out to be a shipwreck. Back on the beach, Michael has completed his raft and there is an emotional farewell with the group, nonemoreso than a brief reuniting of Jin and Sun and the handing over of ownership of the dog Vincent into the hands of Shannon.
Quite an emotional episode, especially with a touching scene between Sawyer and Jack.