Code Geass: Lelouch of the Rebellion: Season 2, Episode 19

2 - 19: Turn 19 - Betrayal

Nunnally is gone. Lelouch cannot deal with the grief, and as he locks himself away, Prince Schneizel calls a temporary ceasefire to reveal the truth behind Zero to his Black Knights. When they learn of his Geass, will this be the end of the Black Knights?