Marie was a student at a girls' school in Flint, Michigan who created a "Supernatural" fan fiction musical.
Unsatisfied with Carver Edlund ending Supernatural with Dean quitting hunting to live with Lisa and Sam mysteriously back from Hell, she decided to create her own "transformative" fan fiction in the form of a play.
However, her play attracted the deity Calliope, who proceeded to kidnap everyone who tried to cancel the play. Marie assisted the real Sam and Dean Winchester in finding and killing Calliope. Marie later gave Dean a fake amulet to replace the one he threw away, while hinting she is aware of his true identity.
Marie took the role of "Sam Winchester" in the play, replacing Maggie. She sung "Carry On My Wayward Son" at the end of the performance.
Later that day, Marie met Carver Edlund, excited asked how it was as he praised her work, calling it "Not bad".
- Marie revealed to Dean that she is a Sam-girl, believing Sam to be brave and selfless.
- It appeared after the play she now believed Dean and Sam were real as she gave Dean a replica of Dean's Amulet and criticizes him for throwing the original away.