Ghost Lady appears in the episode "The Creeps." She doesn't say anything at all in the episode. She appeared out of nowhere, scaring Finn into breaking through the wall out of fear. She then appeared in "King Worm," as one of Finn's greatest fears. She appears again in The Vault, and became friends with Princess Bubblegum. She was accidentaly fallen in a toxic pit.
- Fans believe that she may be Marceline.
- In The Vault, her remains serves as fertilizer in the soil, causing it to grew a tree, making it the Tree Fort today.