Grey's Anatomy Previews: "Tainted Obligation"

Below are three sneak previews from tomorrow's all-new episode of Grey's Anatomy, "Tainted Obligation." Alex receives a wake up call from a bear. A real bear, not Yang's Mr. Bear.

He decides after this incident that trailer life is not for him and he wants to move back to Mer's. Izzie's not up for that move, however, as she's trying to move forward, not back ...

Follow the jump for two more clips from "Tainted Obligation," in which Izzie treats cancer patient waiting for the right moment to propose to his girlfriend of eight years, and (as teased in last week's promos), Meredith and Lexie's father Thatcher arrives in rough shape ...