Violence ensues and a mysterious island beast makes a re-appearance when Michael and Locke clash over Walt's upbringing.
Meanwhile, Charlie is tempted to read the missing Claire's diary, and Sayid enlists Shannon to help decipher the French woman's map.
original airdate--January 19,2005 rating--19.67 million
song--"Main Title" (Composed by J.J. Abrams)
Flashback: Michael Dawson and Walt Lloyd