
The Mouse That Roared
They're taking over the country in an invasion of laughs!
1959 • 83 min • Comedy
Synopsis
The Duchy of Grand Fenwick decides that the only way to get out of their economic woes is to declare war on the United States, lose and accept foreign aid. They send an invasion force (in chain mail, armed with bows and arrows) to New York and they arrive during a nuclear drill that has cleared the streets.
Our family guide
Best from age 8- 100 Reviewers · 1 · 51%
- 64 Audience · 144 · 49%
The tiny Duchy of Grand Fenwick devises a plan to solve its financial troubles: declare war on the United States, lose quickly, and then receive foreign aid. However, their quaint invasion force, armed with bows and arrows, arrives in New York City during an unusual nuclear drill, leading to unexpected outcomes.
- Violence & peril
- 1/10
- Language
- 0/10
- Drinking, drugs & smoking
- 0/10
- Romance & sensuality
- 0/10
- Scary moments
- 1/10
Heads up
- Discussions of war, though comedic
- A nuclear drill is depicted
- Some old-fashioned gender roles
What it models well
- Thinking creatively
- Challenging assumptions
- Underdog triumphs
Talk about it after
- What is satire and how does this movie use it?
- The unexpected consequences of actions
- How countries resolve disagreements
Written by the Movie Knight editorial team for The Mouse That Roared. Our own words, our own scoring — always double-check against your family's standards.
Where to watch
Free with ads
- YouTube Free
Rent
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Buy
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Links go straight to each service. Some are affiliate links that support Movie Knight at no cost to you. Availability data by JustWatch via TMDB.
Top billed cast
Director: Jack Arnold • Crew: Roger MacDougall, Stanley Mann

Peter Sellers
Grand Duchess Gloriana XII / Prime Minister Count Rupert Mountjoy / Tully Bascombe

Jean Seberg
Helen Kokintz

William Hartnell
Will Buckley

David Kossoff
Professor Alfred Kokintz

Leo McKern
Benter

MacDonald Parke
General Snippet

Austin Willis
United States Secretary of Defense

Timothy Bateson
Roger

Monte Landis
Cobbley

Alan Gifford
Air Raid Warden
Trailers & clips
The Mouse that Roared Trailer
Reviewer notes
RecommendedTrusted family reviewersPeter Sellars plays just about everyone in this light-hearted comedy about a tiny European Grand Duchy that comes up with a cunning plan to address it's shocking balance of trade problems. It decides to invade the United States! Armed with little more than halbards, helmets and lances, they sail into New work harbour and take the place unopposed. What's going on?…
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Gallery
Details
- TMDB audience
- 6.4/10 (144)
- Age rating
- PG
- Status
- Released
- Franchise
- Duchy of Grand Fenwick Collection
- IMDb
- tt0053084
Keywords

YouTube Free
Amazon Video
Apple TV Store
Google Play Movies
YouTube
Fandango At Home






