At the end of the first season, Kallen reveals her identity to the students of Ashford Academy when the Black Knights occupy it as their base of operations, convincing the student council that they will not be harmed. Later on, she battles against Suzaku in his flight-equipped "Lancelot", suffering a narrow defeat. Lelouch intervenes before Suzaku can deliver the finishing blow. When Lelouch abandons the battle to rescue his sister, Kallen follows him. She witnesses his confrontation with Suzaku and learns about his true identity, the truth about the massacre of SAZ, and his Geass power. She flees in shock rather than helping Lelouch to deal with Suzaku, and goes into hiding. In "Oz the Reflection", she briefly helps Orpheus Zevon in battle before rejoining the Black Knights.