 She was voiced by Felicity Jones in the first season and Helen Sadler in the second season.Jyn is introduced as a child in the prequel novel "" by James Luceno, published in November 2016.In the novel, Republic Lieutenant Commander Orson Krennic saves his old friend Galen Erso and his family from a coup, and enlists the scientist to develop energy technology using kyber crystals that would ostensibly be applied to altruistic purposes.