|"Nunnally Held Hostage"|
|Original Air Date||February 1, 2007|
|English Air Date||August 9, 2008|
|Written by||Ichirō Ōkouchi|
|Directed by||Kazuo Miyake|
Nunnally Held Hostage is the sixteenth episode of Code Geass: Lelouch of the Rebellion.
C.C. departs as a messenger to the Chinese Federation and Milly has a marriage interview with Lloyd Asplund, creator of the Lancelot. Mao returns to kidnap Lelouch's sister, Nunnally, and holds her hostage in the Ashford Academy sewers. Lelouch and Suzaku work together to rescue her, with Suzaku's physical adeptness and the clever use of Lelouch's Geass proving to be beyond Mao's planning. Before he can be arrested, Mao reveals Suzaku killed his own father, Genbu Kururugi; in return, Lelouch silences him with his power and C.C. returns to end Mao's life as Suzaku crumbles to the ground, confronted with his actions after years of secrecy.