Elizabeth eventually discovers that "Z" is not just a figment of her son's imagination but was actually her own "imaginary friend" when she was a child.

Initially, parents Elizabeth (Keegan Connor Tracy) and Kevin (Sean Rogerson) find their son's new friend harmless. However, Joshua’s behavior quickly becomes aggressive and disturbing, leading to his suspension from school.

The entity is revealed to be a malevolent presence that has returned to "marry" Elizabeth and live with her, using her son as a conduit to reach her. Film Details "The Twilight Zone" Blurryman (TV Episode 2019) - IMDb