Maggie Smith died in September 2024 and her last role was in a film following a group of working-class women from Dublin.
Gráinne Keenan and Diarmuid Noyes also star as Fiona and Michael, Jim's other two children, reports the Irish Mirror.
It: Welcome to Derry now joins a long list of excellent prequels, offering a backstory to 2017’s It and 2019’s It: Chapter 2.