Coming up on Grey's Anatomy May 14 and 15:

"17 Seconds" - Finn gives a health update on Doc, Meredith is assigned to work with Callie for the day while George gets paired with Derek, and Burke and Izzie continue to try to find a heart for Denny, on part one of the season finale on Sunday, May 14 (10:00-11:00 p.m., ET).

In the first hour of part two of the season finale -- "Deterioration of the Fight or Flight Response" -- Izzie and George attend to Denny as the pressure increases to find him a new heart, Cristina suddenly finds herself in charge of an ER, and Derek grapples with the realization that the life of a friend is in his hands.

In the second hour, "Losing My Religion," Richard goes into interrogation mode about a patient's condition, Callie confronts George about his feelings for her, and Meredith and Derek meet about Doc. Part two of the season finale of "Grey's Anatomy" airs Monday, May 15 (9:00-11:00 p.m., ET).