You Don't Know What You've Got Till It's Gone

Summary

Sheldon fears the worst when a little girl goes missing from the ER; Addison and Jake have a disagreement about one of his patients; and a new doctor joins the team at Saint Ambrose. Meanwhile, Stephanie questions Sam about his past with Addison.

Guest stars

• Kylie Rogers as Sarah Nelson
• Matt Long as James Peterson
• Tisha Campbell as Pam Reiter
• Carter MacIntyre as Nick Calhoun
• Justina Machado as Stephanie Kemp
• Missy Yager as Megan Stewart
• Charlie Hofheimer as Ron Nelson
• Chryssie Whitehead as Dana Nelson
• Steve Zissis as Todd Reiter
• Angela Bullock as Clara