Lost5whathappenedkate "If I understood why Jack does what he does, I sure as hell wouldn't be sitting here."

Whoo-hoo! After a lull last week, the Peabody Award-winning "Lost" was back in fine form with "What Happened, Happened." It might also have been titled "Role Reversal," because that's what we've got going on with some of our key characters.

But for starters, let me offer a few kind words to Kate, who has annoyed me more often than not during the run of the skein to date. And the kindness should extend to Evangeline Lilly, who was very good in last night's seg. I've been hard on her in the past for being wooden, especially in her big emotional moments, but she showed some growth as an actress in this seg.

I particularly liked Kate's flashback scenes back in L.A. (I presume) with Sawyer's ex, Cassidy (played by the talented Kim Dickens, who some of us know better as Matt's mom on "Friday Night Lights").

This episode was also fulfilling because we got a lot of recent backstory filled in in a short amount of time — and very straightforwardly too, unusually so for "Lost." It felt like a real come-to-Jacob episode for Kate, Jack, Sawyer and Juliet.

In a nutshell, we see Kate turning into a real warrior-avenger; Jack turning into an utterly self-obsessed cretin who is so lost he's turning to island-religion to try to make sense of things; Sawyer starts out desperate to protect his new settled-down status quo but ends up doing the right thing in the end — all things that we'd never have expected from Sawyer even last season; and we got a Great Moment with an Angry Juliet that came as the cherry on this cake.

Oh, and at the very end, Locke shows up, just in time to make Ben's life miserable in Lost5whathappenedmh 2007. Somehow I think he's going to get some help from Caesar in this effort.

Amid all the moving and shaking, we're treated two priceless scenes of Miles trying to help Hurley understand Faraday's Law of Time Travel, with a nod to the Zemeckis Theory as laid out by Hurley. (By the way, where is Daniel? And Rose? And Bernard? And what about Vincent??!!). "This is really confusing," Hurley says.

On the backstory front, we got a key piece of the puzzle for Kate and her erstwhile charge Aaron filled in last night as we peeked in on Kate's actions in the days leading up to her decision to board Ajira Airways Flight 316.

As many of us suspected, she's not particularly interested in following Jack to the ends of the earth — despite what she tells Juliet in the quote above — but she's actually on a mission to find Claire, Aaron's rightful mum. Until then, the next best thing she can do is give Aaron to his biological grandmother, Carol Littleton. (No relation.)

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