Everybody is clearly on edge this week on Grey's Anatomy, and not just because of supercharged pregnancy hormones in Meredith's case (see the first Grey's Anatomy sneak peek we posted yesterday).

The hospital faces a huge financial setback and as a result, Chief Hunt explains that Dr. Alana Cahill (Constance Zimmer) is there to monitor the daily operations and make things more efficient.

From the moment Derek meets her, it's clear there will be tension brought about by her presence. If things were typical, she wouldn't even be there. Will the team get used to it, or butt heads?

Meanwhile, Arizona struggles with the emotional and physical pain of a phantom limb, and Hunt devises a simple, but effective method that may help her brain re-learn that the pain is not real.

Watch three scenes from "Walking on a Dream" and see what you think below:

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.