The Others in the Temple are on high alert at the approach of the Man in Black. Jack and Hurley follow the instructions of Jacob to a lighthouse, in order to assist with the approach of an unknown visitor. In the afterlife timeline Jack is shown to have a strained relationship with his son which he wants to heal.
original airdate: February 23, 2010 rating--9.95 million
music--"Main Title" (Composed by J.J. Abrams)
flash-Sideways: Jack Shephard
Goof: At the lighthouse Hurley asks Jack to let him know when the dial reaches 108 degrees.When Hurley starts to pull the chain, to rotate the dial, the chain is a well used one. In the next shot (closeup of pulley/gears) the chain is obviously a brand new chain.