While the emotional weight carries the episode, the tactical planning between Jack, Danielle Rousseau, and Sayid provides a high-stakes backdrop that builds immense momentum for the finale. Critical Reception

As the survivors prepare for a final confrontation with the Others, Jack devises a plan to rig their tents with dynamite to ambush the incoming raiding party. Simultaneously, Sayid discovers a way to jam the Others' communication system, but it requires someone to swim down to an underwater DHARMA station known as "The Looking Glass". Charlie Pace, knowing from Desmond’s premonitions that he will likely die in this mission, volunteers for the job.

Some viewers find the "Others vs. Survivors" conflict at the beach to be a slow build compared to the intensity of the underwater mission. Verdict

Lost – Season 3, Episode 21 Greatest Hits Jack devises a plan to get rid of the Others for good; Sayid finds a flaw in the Others' Rotten Tomatoes

Critics and fans alike praise the episode for its focused character work. It currently holds a high standing on "best of" lists for the series.

The emotional payoff of Charlie’s list and the masterful way it ties his pre-island life to his current bravery.

"Greatest Hits" is a masterclass in how to say goodbye to a series regular. It balances the "Island Mystery" (the Looking Glass station) with the "Human Element" (Charlie’s legacy), making it essential viewing that sets the stage for the legendary "Not Penny's Boat" moment in the following episode.