|Portrayed By||Beverley Owen, Pat Priest, Debbie Watson, Jo McDonnell, Hilary Van Dyke, Christine Taylor, Elaine Hendrix, Charity Wakefield|
|Series||The Munsters, The Munsters Today, Mockingbird Lane|
|Film(s)|| Munster, Go Home!|
The Munsters' Revenge
Here Come the Munsters
The Munsters' Scary Little Christmas
|Mother|| Lily's Sister|
Elsa Hyde (in Here Come the Munsters)
|Other Family|| Herman Munster (uncle)|
Eddie Munster (cousin)
Grandma (grandmother, deceased)
Katja Dracula (grandmother) (in The Munsters Today)
Lester Dracula (uncle)
Cousin Phantom of the Opera
Lily's Unnamed Grandmother (deceased)
Medusa (great-great grandmother)
Lily's Unnamed Mermaid Cousin
Marilyn Munster is the niece of Lily Munster and Herman Munster and the granddaughter of Grandpa. She is also the cousin of Eddie Munster, Herman and Lily's son.
Not much is known about Marilyn's life. She was taken in by her aunt and uncle after her parents died in a chemistry explosion, and later took their name. It is known her mother is Lily's sister; however, in one iteration, she is the daughter of Herman's sister who had married Dr. Jekyll.
Marilyn is a very kind person, and she looks after both her cousin, Eddie and the family pet, Spot. She is very attractive (although homely by Munsters standards), and dates often, but very few of her dates ever enter the family home. She attends Westbury College, once nearly losing her scholarship. She is very close to her Aunt Lily, the two of them frequently observing her uncle and grandpa getting into shenanigans.
- There seem to be three iterations of Marilyn in the multiple franchises. There is the original Beverley Owen/Pat Priest Marilyn (followed by The Munsters Today, Munster, Go Home!, The Munsters Today and The Munsters' Revenge.) There is the 1990s version seen in Here Come the Munsters and The Munsters' Scary Little Christmas, and there is the reboot Marilyn Mockingbird Lane, each of whom have differing histories and family trees.
- A Walk on the Mild Side
- Grandpa Leaves Home
- Herman, Coach of the Year