Elizabeth Mitchell as Juliet Burke on Lost. She's been a terrific actress since she was first introduced on the show, but her character has gotten better and better.

Behind them lies plenty of angst, but Kate Austen's experiences, past and present, have made her who she is today. Who will she become?

Kate looks out the window in "Whatever Happened, Happened." She was the central character of this terrific episode of Lost.

A great scene from "Whatever Happened, Happened," in which Miles and Hurley themselves debate how the heck time travel is possible on Lost.

Jack Shephard returned to the island with a new role (a DHARMA janitor) and a new attitude (not trying to fix anything). But he still doesn't know what he's even doing there.

Evangeline Lilly is one of the planet's most beautiful females, and a pretty terrific actress on Lost, to boot.

Hugo Reyes (Jorge Garcia), also known as Hurley, in "Whatever Happened, Happened," the April 1, 2009 episode of Lost.

Evangeline Lilly as Kate Austen in "Whatever Happened, Happened," the April 1, 2009 episode of Lost. She's a great actress - and great looking, too.

Sawyer (as LaFleur) inspects the cell where the hostile (Sayid) broke free in "Whatever Happened, Happened," the April 1, 2009 episode of Lost.

Jim LaFleur (a.k.a. Sawyer) talks to Kate in "Whatever Happened, Happened."

Dudes from the DHARMA initiative circa 1977 talk things over in "Whatever Happened, Happened."

Kate Austen (Evangeline Lilly) in "Whatever Happened, Happened."