← Previous Next → 4x17 Freedom (2) 5/5 (1 vote) First Aired: May. 22, 2008 on ABC Summary: 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.

Main Characters in this Episode

• Dr. Meredi…
• Dr. Cristi…
• Dr. Alex K…
• Dr. Mirand…
• Dr. Richar…
• Dr. Callie…

• Dr. Mark S…
• Dr. Lexie …
• Dr. Erica …
• Dr. Derek …

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Guest Stars Dr. Izzie Stevens played by Katherine Heigl Dr. George O'Malley played by T.R. Knight Dr. Wyatt played by Amy Madigan Ava played by Elizabeth Reaser Nurse Rose played by Lauren Stamile Andrew Langston played by James Immekus Liz Monroe played by Kathryn Meisle Ken Monroe played by John Cothran Lola played by Jana Kramer Adele Webber played by Loretta Devine Beth Monroe played by Jurnee Smollett-Bell Firefighter played by Stephen Bishop (II) Kip played by Sterling Knight David played by Jerry Zatarain Jr. Will played by Christian Alexander Nurse played by Dana Blackstone More