Cecilia Saint, played by Candice Alley, made her first screen appearance on 11 November 2015. The character and Alley's casting was announced on the same day. Alley auditioned for the role and learned she had been successful a couple of days later. She commented that the cast and crew had been very welcoming towards her. Of joining the show, the singer said "With such a love for acting, I feel so fortunate to be part of such an iconic Australian series and working with such an amazing team of people." Alley filmed her first scenes in August, and returned to the set in 2016 to continue her character's storyline. Cecilia was billed as "a mysterious woman" who becomes involved in a scheme to unhinge Stephanie Scully (Carla Bonner). Alley told a New Idea reporter that she enjoyed "being able to delve into a character who's also a single mother."