To rehash, Katie first showed up at what was then Seattle Grace on Merediths very first day.
After some detective work, she figured out that Katie had burst an aneurysm and was bleeding.
Together, she and Derek saved her life.

Credit: Mitch Haaseth/ABC
Luckily, the first option is the winner.
Meredith isnt so lucky.
Riggs comes in, and the two quibble over what to do.
Because now seems like a great time for that.
After plenty of pushing, Daphne makes the call.
Then she bleeds everywhere.
Lets think about David for a minute here.
He makes the extremely tough decision to go visit, and then he shows up and…shes dead.
David just had a sty day.
This isnt to say that Daphne was wrong to call him.
But still: Poor Daniel.
Eventually, Maggie casually confesses to Webber that she likes DeLuca but that she appreciates him being protective.
Then they decide to ditch DeLuca, whos still busy doing that aforementioned grunt work, and grab dinner.
Interns still have to do intern duties, no matter how connected with the higher-ups they are.
While Maggies coming clean with Webber, Riggs is coming clean with Meredith.
Then the helicopter disappeared, and now Owen blames Riggs for it.
Related: How do so many people get in aircraft crashes on this show!?
Plus, hes cute (almost said dreamy, but…).
Owen and Amelia, however, arejumping into a relationship again.
After having great sex, the two decide to start at square one as if theyd never met before.
This always seems like a horrible idea when fictional characters introduce it because, well, theyhavemet before.
So even though Amelia and Owen seem cute now, there are probably darker days ahead.
This is Greys Anatomy, after all theres no such thing as happily ever after here.