GREY'S ANATOMY - &quot;The Becoming&quot; - The nurses' objections to McSteamy's trysts lead to the instating of a new &quot;date and tell&quot; policy. Meanwhile news of Burke's latest career achievements force Cristina to face her feelings for her ex, Meredith and Derek admit a veteran soldier into their clinical trial, and Callie turns to Sloan in her time of need, on &quot;Grey's Anatomy,&quot; THURSDAY, MAY 8 (9:00-10:02 p.m., ET) on the ABC Television Network. (ABC/VIVIAN ZINK)ELLEN POMPEO