Episode: 4×17 (Season 4 Episode 17)
Name: Freedom (2)
Originally Aired: May. 22, 2008
Plot: In the two-part season finale, Meredith and Derek take another shot at the clinical trial while the others race to free a boy from a hardening block of cement. Meanwhile, Izzie helps Alex care for Rebecca and Lexie learns a secret about George’s intern status.
