meridith and christina went on burke and christina's honeymoon
george and callie were away on holiday
alex went in direction of Ava/Rebecca's address but don't think he got there
izzie stayed at home all miserable and lonely as she didn't hear from george in 17days
they all arrive back at hosp and meet their new interns - george is one of Merediths having failed the previous year
Lexie is one of Christinas (Lexie is meredith's half sister)
car crash - man internally decapitated with skull only held on by skin saved by McDreamy
pregnant woman has arm severed off but saved by McSteamy and baby delivered by George
weirdy fat bloke who ate cotton balls/coins/scissors/clips etc saved by Miranda
Izzie saves deer that was hit during car crash
McDreamy tells Christina that burke has handed in resignation and won't be coming back
McDreamy and McSteamy have a slight bonding moment
the chief eplains to miranda that he gave Chief Resident to Callie because Miranda is too talented a surgeon to be wasted in management and she'll thank him for it one day
Lexie tries to talk to Meridith but she decides not to take her up on it
Meredith and Derek decide to break up and then have sex
Izzie shouts at george and then george turns up at the house after work to tell Izzie he loves her too
I think thats about it