...things they did without me knowing...

If I were Denny on Grey's Anatomy, and I died, and I broke Izzy's heart and ended Love (this is particularly potent tonight), How would I come back? And How would it be Justified?

I loved Denny alive. I was sad that he died. But. I do not want him back as a ghost, or a flashback, or a look-alike twin, or an alien visitor. So whatever TPTB are planning in having Jeffrey Dean Morgan tape scenes for new Grey's episodes better be very very well thought out.