Series Finale:     
Episode 121 — The End
On the island: Locke’s group:
– Finds Desmond with Rose and Bernard; threatens to kill them if Desmond doesn’t go with him
– Meets Jack’s group and treks to the bamboo forest together
– Lowers Desmond into the cavern to the heart of the island
– Desmond moves the stone from the pool in the cavern
– Jack discovers Locke is mortal now and he can be hurt
– Earthquakes rip the island apart and it starts to heat up inside the cavern
– Locke knocks Jack unconscious and runs away
– Jack and Locke fight on the cliff
– Kate kills Locke, and Jack kicks him over the cliff

On the island: Jack’s group:
– Sawyer discovers Desmond is missing from the well
– Treks to the bamboo forest
– Meets Locke’s group and continues with them
– Kate and Sawyer take the Elizabeth sailboat to Hydra island
– Jack, Hurley and Ben return to the heart of the island
– Jack sacrifices himself to return the stone to the center of the pool and stop the island’s destruction
– Jack’s body washes out of the cavern, and he stumbles to the bamboo forest
– Jack dies as he watches the Ajira plane fly away off the island

On the island: Alpert’s group:
– Miles finds Alpert in the jungle and he’s okay
– They paddle over to Hydra island to blow up the Ajira plane
– Discovers Lapidus alive in the ocean clinging to life preservers
– They decide to fly the plane off the island since Lapidus is a pilot
– Lapidus makes the necessary repairs and starts the plane
– Kate promises to help Claire raise Aaron, and Claire joins Kate and Sawyer
– Sawyer, Kate, Claire, Alpert, Miles and Lapidus take off in the plane

Flash sideways:
– Oceanic delivers Jack’s father’s coffin to the church
– Hurley shoots Charlie with tranquilizer and drops him off backstage
– Miles sees Sayid and warns Sawyer; tells him to check on Sun at the hospital
– Sun and Jin meet Juliet; Sun and Jin experience flashes of their lives on the island
– Hurley arranges for Sayid to meet Shannon; they experience flashes of their lives on the island
– Drive Shaft performs at the concert; Charlie sees Claire in the audience
– Claire goes into labor, and Kate helps her deliver baby Aaron
– Kate, Claire and Charlie experience flashes of their life on the island
– Juliet meets Sawyer at the hospital, experience flashes of their island life
– Locke wakes up from surgery and sees flashes of his life on the island
– Jack arrives late to the concert and talks to Kate
– Kate takes Jack to the church
– Jack speaks to Christian and experiences flashes of his life on the island
– Everyone meets inside the church and moves on together
Courtesy ABC.
First aired: May 23, 2010.