Christina Mackenzie appears in *Mobile Suit SD Gundam's Counterattack* among its ensemble cast. Her established background originates from *Mobile Suit Gundam 0080: War in the Pocket*, where she serves as an Earth Federation Forces officer and test pilot. Stationed at a secret Side 6 research facility, she operates the RX-78NT-1 Gundam "Alex" despite not being a Newtype, leveraging her exceptional skills to adjust its learning computer as a "shoe-fitter." She shares a sibling-like bond with her neighbor Alfred Izuruha, whom she once babysat. During the conflict, she forms a romantic connection with Bernard Wiseman, unaware he is a Zeon infiltrator assigned to destroy the Alex. Piloting the Alex against Zeon forces, she unknowingly engages Bernie in his Zaku II in a forested area and kills him, discovering his identity afterward. After recovering from battle injuries, she departs the colony and later writes to Alfred expressing hope to reunite with him and Bernie, remaining unaware of Bernie’s death. In SD Gundam games like *SD Gundam G Generation SEED* and *World*, she features with abilities such as "Lucky," "Concentration," "Diligent," "Agile," and "Iron Wall," reflecting her Federation service and piloting expertise.