" 14. The Becoming " is the 14th episode of the fourth season of the medical drama Grey's Anatomy . This draft write-up covers the primary plotlines and character arcs featured in the episode.

Cristina experiences a moment of rare vulnerability and levity. She famously belts out a tune while performing surgery in a silent operating theater, showcasing her unique way of handling high-stakes stress.

As the season progresses, the "becoming" refers to the doctors' growth into their specialties and the hardening of their professional identities.