After Kallen returns to the Black Knights, she learns of C.C.'s memory loss and realizes that Lelouch is alone. When Zero's identity is revealed, she tries to defend him. The others won't listen, suspecting that Lelouch is controlling her. She asks Lelouch what she means to him, expressing a willingness to die with him. Seeing no way out, Lelouch mocks the Black Knights for taking so long to realize the truth, then calls Kallen a pawn. As Kallen walks away feeling betrayed, he whispers "Kallen, you must live on" within earshot. She unsuccessfully tries to get the Black Knights to wait after their first attempt to kill Zero fails thanks to Rolo Lamperouge, and is left standing on the hangar floor when Rolo uses his Geass to escape with Lelouch. After Lelouch's escape, Kallen tries to protest how Ohgi and the others have discarded Zero so readily despite all that he has done for them, but they refuse to listen, still angered at the idea that they were merely being used as pawns. When Lelouch is crowned Emperor, Kallen and the rest of the Black Knights are visibly stunned.