In 34 ABY, C'ai Threnalli and R3-Z3's X-Wing crashed onto the surface of Starkiller Base. C'ai, R3-Z3, and Resistance pilot Lieutenant Wright fought First Order forces in order to escape the planet's surface.
R3-Z3 was an Astromech droid in LEGO Star Wars: The Force Awakens, appearing in the Escape from Starkiller Base DLC level.