(S06E19) This episode of 'Grey's Anatomy' finally gives the viewers the backstory of Alex Karev by introducing Alex's brother Aaron. They also planted the seed that Izzie won't be coming back by lightly mentioning divorce papers in the first five minutes of the show. Since Katherine Heigl is out, I wonder what will happen to Izzie's eggs?

The episode straddled the line between over the top and well executed. There were definite heart-tugging moments matched with actual interaction between Alex and Meredith and Bailey being an excited mother. To counteract this, I'm not on board with the whole "Callie wants a baby" storyline anymore, and I'm not feeling the Mark/Teddy relationship.

Two Karevs in the same room together? There's gonna be trouble and, sure enough, there was trouble on 'Grey's Anatomy' (Thu., 9PM ET on ABC). And a few headbutts and knuckle-punches, too. Leave it up to Bailey to pull the squabbling brothers off each other.

But at least the fight offered a few clues to Alex's past, including the fact that he's got daddy issues and his family's completely dysfunctional. It's no wonder Alex was a mess when he started at Seattle Grace.

Watch the video after the jump.

(S06E06) There were so many people on screen last week on Grey's Anatomy that I didn't even realize that Mark Sloan wasn't in the whole episode. Luckily for any Mark fan, he becomes an essential character when burn victims show up.

This week, one of many hotel fire victims dies because of negligence; everyone tells their side. The multiple perspectives became more and more difficult to keep up with, because the original Seattle Grace doctors defended each other, while the Mercy West doctors tried to throw any of the Seattle Grace doctors under the bus.

A lot happened in this week's Grey's Anatomy, including Meredith making the difficult decision to give her dad part of her liver. That's convenient for the real-life Ellen Pompeo, who just had her baby on Sept. 15.

And there's still the issue of the Mercy West merger, which docs will get the axe, and the usual patient drama and staff angst. But what stood out for me happened in the first few seconds of this episode, when Alex stepped outside of Derek's trailer and came face to face with a bear. Alex screamed! The bear screamed! Everyone screamed! But mostly Alex!

I wonder how many takes it took for Justin Chambers to get that awesome girly scream. Or perhaps it was dubbed in? Whatever the case, it surely is one of the best TV screams I've heard in quite some time, and Michael agreed that Alex should get more storylines with funny situations.

What did you think of Alex's scream? Are there any others in recent TV history that even come close?

"The pager is sacred. Sacred sparkle." -- Izzie

A sparkly pager, some quick-drying cement, and a field of candles all play into tonight's 2-hour episode -- the Season Four finale of Grey's Anatomy. Has it really been only four seasons? Because it seems like so much more.

Anyway, tonight we learn a little more about some of the interns' history. For one thing, via a therapy session (and why can't I have Amy Madigan as my therapist?), we learn that young Meredith saw her mom slit her wrists, then had to wait for her to pass out before calling 911.

Meredith says her mom wanted to die, but by the end of the episode, she figures out that she really didn't want to die. Being a brilliant surgeon, her mom would have known the faster road to death entailed slitting her carotid artery.