- Played by Harold Perrineau
BEFORE THE CRASH
- Construction worker, sketch artist
- Brutal car accident resulted in long hospital recovery
- Ex-girlfriend Susan used accident to gain full custody of their son Walt
- Got custody of his son back when Susan died from a rare blood disorder
- Afraid he can't take care of Walt by himself
- Took Vincent for his son to make him happy
ON THE ISLAND
- Befriended Sun, which made her husband, Jin, jealous
- Was the first to know that Sun could speak English
- Envious of his son Walt's friendship with Locke
- Finally bonded with his son over box of drawings and letters to Walt that his ex-girlfriend had kept hidden
- Built raft, but Walt burns it to remain on the island together
- Built and launched a second raft, only to have his son, Walt, kidnapped several miles from shore
- After drifting back ashore with Sawyer, he was captured by the tail section survivors, who include Ana-Lucia Cortez and Libby
- When released from the pit, he runs into jungle looking for Walt only to be convinced to come back by Mr. Eko and Jin
- With Locke's help rescues Walt from Polar Bears
- Communicated with someone who may have been Walt through the Station 3 Computer
- Locked Locke and Jack in the arsenal and then ran off apparently following instructions from the Computer
- Probably is not being held by The Others, as implied by Zeke's comment in The Hunting Party: "Don't worry about Michael. He's not gonna find us."