A betrayal intensifies the issues between Cristina and Meredith; Matthew and April make a decision about their relationship; Bailey faces difficulties with Ben's return.
April's visiting sisters get on her nerves; when Matthew and Jackson witness an accident, they must work together; Callie and Arizona work on their relationship.
The final episode of the drama sees Michael and his compatriots make one last bid to bring down the Company.
When a man in full clown costume shoots a bakery owner, the CSIs investigate and discover a decision from Flack's past that may put him in jeopardy. (TV-14)
MacGyver's Aunt Gwen (Jeri Ryan) gets into his head and convinces Mac and Riley to join Codex.
