"Manifesting Destiny" is an orchestral piece on the Season 3 soundtrack. It plays during the season finale.
Bonnie and Greta go to call Ben. Charlie sees a blinking yellow light in the adjacent room and remembers what Desmond told him.
The piece ends on Desmond's flashes motif.
Charlie's destiny of sacrificing himself in the Looking Glass begins to manifest itself. The title also references Manifest destiny.