Sayid is looking for a signal, while Walt is looking for his dog. What they actually find out is a transmission and a secret. -
Overall, this episode was much better than the first one. First of all, we got to learn more about the supporting cast and the exploration of the characters was very well done (I especially liked the twist involving Kate being a fugitive). But what made this episode really special was the introduction of some of the show's many mysteries. The polar bears, the nature of the Monster, the mysterious distress signal etc. were all presented perfectly and, all together, created a superb cliffhanger. Very well done.