BEFORE THE CRASH:
- Lance Corporal in the Royal Scots Regiment of the British Army
- In love with Charles Widmore's daughter, Penny
- Entered Widmore's sailboat race to prove himself to Charles and win back Penny
- A sailing accident stranded Desmond on the island
- Did not enter the code in time and unknowingly caused the crash of Oceanic flight 815
ON THE ISLAND: Desmond joins the survivors' camp and begins seeing visions of the future, including the death of Charlie.
OFF THE ISLAND: Desmond reunites with his beloved Penny when her boat rescues him, Frank Lapidus and the Oceanic 6. He refuses to leave Penny's side, even when Jack tries to convince him and the Oceanic 6 to return to the island. The next day, Ben shoots him, but Desmond survives and maintains his promise to never leave Penny.