They include Dick Van Dyke, Angela Lansbury, and Meryl Streep.
The film will star Emily Blunt as the role made famous by Julie Andrews, as well as some living legends who make up the supporting cast.
Streep is playing Mary’s cousin Topsy, and recently explained why she decided to sign on for the mysterious role.
Mary Poppins Returns will pick up decades after the events of the 1964 classic, as the titular nanny returns to the Banks family when they are once again in need for her guidance (and the occasional musical number).