Jeff Staron

Phil and Claire had a huge fight and Phil hasn't a clue as to what it was over, so Gloria steps in to counsel Phil and Jay takes Claire. Meanwhile, Jay may have some regret in buying Gloria a karaoke machine, and Cameron is in full prep mode for a huge fundraising event and enlists help from Mitchell and Luke -- which might not be the best choices.

A patient's condition sparks a conversation between Richard and Maggie about Alzheimer's disease; April and Jackson struggle to return to their normal lives and Arizona is faced with the reality that Callie is moving on. Meanwhile, Meredith reveals her biggest fears about Derek.

When Berta takes a couple of days off, Charlie falls for her replacement (guest star TONITA CASTRO). Meanwhile, Alan believes he's being stalked by Lyndsey's ex-husband. Courtney Thorne-Smith returns as Alan's former girlfriend, Lyndsey and Judd Nelson returns as her ex-husband.

In an effort to take more risks as an actress, Tori goes to an ungrounded spot called "The Gorilla Club" where she tests herself by performing unusual physical challenges.

Walden is trying his best to impress his new love interest, Zoey, when Bridget reappears in his life. MELANIE LYNSKEY returns as Rose.