Nicola went into labour prematurely after she went upstairs to investigate strange noises, where she got a fright which caused her to fall down the stairs at 11 Coronation Street. Nicola decided to name the baby after the man she considered to be her real father, Isaac Rubinstein; much to the relief of Eileen Grimshaw. It was revealed that baby Zack's paternal aunt Faye Windass was behind the loud noises as she wanted to make Eileen suffer; as Faye's mum Anna was incarcerated at Norcross Prison for a crime she never committed.
- Zack was played by Alfie & Mikey Fletcher for most of his 2018 appearances, with Phoenix & Sebastian Winnington appearing briefly in three episodes. The Winnington twins returned to the role for the character's 2019 appearances.
List of appearances