The Boy Who Was Forgotten is a micro-series about Wren Castell, a woman who can see the imaginary friends people have forgotten. When she meets Sam, an imaginary friend who has waited 23 years for the child who created him to return, an object from his past triggers a memory Wren cannot explain. Then she sees Iris — a mysterious woman who seems to know something about Wren's forgotten past.

The pilot introduces Wren's ability, Sam's story, and the larger mystery of why forgotten imaginary friends are disappearing.