School Spirits season 3 was a roller coaster ride from start to cliffhanger finish - and Us is here to provide all the answers. The series, which premiered in 2023, kicked off by following 17-year-old Maddie (Peyton List) as she tried to investigate her own mysterious disappearance from the afterlife alongside fellow ghosts Wally (Milo Manheim), Charley (Nick Pugliese), Rhonda (Sarah Yarkin) and the only living person she could still contact, her best friend Simon (Kristian Ventura).