: After Desmond Hume "uncorked" the Source, rendering the Man in Black mortal, Jack and Kate managed to kill him.

: Jack, mortally wounded, sacrificed his life to turn the light back on, ensuring the world’s survival and allowing his friends to escape on the Ajira plane . Legacy and Reception

Season 6 introduced a unique storytelling device known as the "flash-sideways." Initially presented as an alternate timeline where never crashed, the finale revealed these sequences were actually a purgatory-like state (the Bardo). In this space, the survivors found one another again after death to "let go" and move on to whatever comes next. The Island's Final Stand

: Jack Shephard eventually accepted his role as Jacob’s successor to protect the "Heart of the Island"—the Source of Light.