Addison returns to Seattle to perform a procedure on Mark's pregnant daughter; Cristina is assigned the lead on a complicated surgery.
The team desperately attempts to prove Tony's innocence after a slew of compromising evidence comes to light and an accusation is made against him regarding the dismembered body parts of a woman found at Quantico.
The team investigate the murder of a Marine who had top-level security clearance, and whose corpse was missing a hand.
Ryan and the team look into a roller coaster crash that seems to have been caused by illegal access to the ride's internal computer.
Jane searches for Lorelei's connection to Red John; the CBI team work with the FBI to investigate the murder of a hotel employee.