Prologue: Finding of the Tetrahedron.

When Danielle finds a ghost hunting weapon while the trio cleans up Sam's attic, Ida Manson tells the story on how Jack Fenton's father Harry Fenton saved her from ghosts and a madman when she was young. Now join Harry in 1948 has he helps Ida after ghosts are unknowingly targeting her and stops the man behind all this during Fenton Works' early ghost hunting days. DPxMCU.