Grey, who was most recently on Broadway in Wicked, plays Dr. Alexander Ball in the episode, which is titled "Nothing to Fear." In "Nothing to Fear," press notes state, "Violet finds out she's pregnant but isn't sure who the father is; Addison struggles with her own guilty conscience after her kiss with Wyatt; and Sam and Pete clash when an old friend and colleague (Grey) asks them to help him die. Meanwhile Charlotte proposes marriage to Cooper."
"Private Practice" stars Kate Walsh as Dr. Addison Forbes Montgomery, Tim Daly as Dr. Pete Wilder, Tony Award winner Audra McDonald as Dr. Naomi Bennett, Paul Adelstein as Dr. Cooper Freedman, KaDee Strickland as Dr. Charlotte King, Chris Lowell as William Dell Parker, with Taye Diggs as Dr. Sam Bennett and Amy Brenneman as Dr. Violet Turner.
Joel Grey was most recently on Broadway as the Wizard in the hit musical Wicked. He won a Tony Award for his role as the Emcee in the original Broadway production of Cabaret and later repeated the role on film to Oscar-winning effect. Grey's other theatrical credits include roles in Chicago, George M!, Goodtime Charley and The Grand Tour, receiving Tony nominations for all three productions. A Kennedy Center honoree, the actor is also a best-selling author; his book of photographs, "Pictures I Had to Take," is available from PowerHouse Books.
The series airs on ABC-TV from 10:01-11 PM ET; for more information visit http://abc.go.com/primetime/privatepractice.