PREVIEW: GREY'S ANATOMY & PRIVATE PRACTICE

"New History" - When Owen recruits his fellow Iraqi War vet, Dr. Teddy Altman, as the new cardiothoracic surgeon, Cristina questions Teddy's abilities in the OR and the nature of their past relationship. Meanwhile Izzie returns to Seattle Grace with her high school mentor seeking treatment for his dementia, and the stress of Richard's responsibilities, post-merger, are taking their toll, on GREY'S ANATOMY, tonight (9:00-10:01 p.m., ET) on the ABC Television Network

GREY'S ANATOMY stars Ellen Pompeo as Meredith Grey, Patrick Dempsey as Derek Shepherd, Sandra Oh as Cristina Yang, Katherine Heigl as Isobel "Izzie" Stevens, Justin Chambers as Alex Karev, Chandra Wilson as Miranda Bailey, James Pickens, Jr. as Richard Webber, Sara Ramirez as Callie Torres, Eric Dane as Mark Sloan, Chyler Leigh as Lexie Grey, Kevin McKidd as Owen Hunt and Jessica Capshaw as Arizona Robbins.

"New History" was written by Allan Heinberg and directed by Rob Corn.

"The Hard Part" - Addison and Sam go for a hike in Malibu, and must perform urgent field care when they stumble upon an expecting couple, trapped in their car after an accident. Meanwhile at Oceanside Wellness, Charlotte, Cooper and Violet treat a newlywed who, out of nervousness for his wedding night, has taken too much Viagra, and Pete and Sheldon hit the bar scene together but fall for the same girl, on PRIVATE PRACTICE, tonight (10:01-11:00 p.m., ET) on the ABC Television Network.

PRIVATE PRACTICE stars Kate Walsh as Dr. Addison Forbes Montgomery, Tim Daly as Dr. Pete Wilder, 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.

"The Hard Part" was written by Steve Blackman and directed by Mark Tinker.