Mimsy's Joke

In Short

This short science fiction story follows a UN-led expedition to Mars, where a team of scientists and a hardened military commander stumble upon the ruins of a dead civilization. They encounter a lonely, eccentric Martian survivor named Staang, who reveals a secret history of human subjugation. By reframing the domestic dog as an alien overlord, the narrative transforms a standard space-exploration premise into a biting, absurd, and darkly funny commentary on the human condition and the nature of power. Its enduring appeal lies in this singular, unsettling twist.

The Story

Oscar Nance, an archaeologist who loves his cocker spaniel, Mimsy, joins Earth’s first crewed mission to Mars. The expedition is led by Commander Boone, a stern military man who values order, discipline, and scientific data above all else. Upon landing on the cold, barren surface, the crew finds a silent city of towering stone, abandoned for millennia. While most of the crew fans out to search for signs of life, Nance, Boone, and a zoologist named Braun explore the city’s interior.

Deep within a crumbling structure, they discover Staang, a fat, shaggy creature with long ears and a gruff, drawling voice. To their shock, the Martian speaks perfect English. Staang explains that his race was once technologically advanced but grew weary of work and intellectual effort. Seeking a life of total leisure, they invaded Earth thousands of years ago. Staang reveals that his ancestors manipulated the Earth’s inhabitants into becoming their servants, providing them with food, shelter, and affection without the humans ever realizing they were being enslaved.

As the realization dawns, Nance pieces together the physical resemblance between Staang and the familiar animals of Earth. The Martian aristocrats are the pampered pets, while the other breeds served as laborers. The crew, particularly the rigid Commander Boone, is forced to confront the irony: humanity has spent centuries providing for the "invaders" under the guise of canine companionship. The "joke" is that humans have been willing, devoted servants to these aliens all along.

Boone, shattered by the loss of his mission’s prestige, decides to leave Staang behind rather than bring the truth back to Earth. As the expedition prepares to return, the crew members struggle to reconcile their findings with their reality. Nance, in particular, looks forward to returning home to Mimsy, though he now views their relationship through the lens of Staang’s revelation. The story concludes with the crew departing Mars, carrying the secret of their planet’s long-standing, quiet subjugation.

How It Unfolds

The call to adventure Oscar Nance is selected for the historic Mars mission, leaving his beloved cocker spaniel, Mimsy, in the care of his landlady. He travels with a crew of scientists and a stern commander, all operating under a plan twenty years in the making.

The arrival on a dead world The ship lands in a freezing, desolate landscape, and Commander Boone immediately orders a cautious exploration of a nearby ancient city. The team finds only ruins, leading them to believe the planet is entirely devoid of intelligent life.

The encounter in the rubble Nance and his companions discover Staang, a strange, dog-like creature living in a dim room. The entity shocks them by speaking English and inviting them to sit on the floor while he explains his history.

The revelation of the invasion Staang details how his ancestors turned Earth into a colony for their own comfort, transforming into the creatures humans now call dogs. He explains that humans have been happy slaves for thousands of years, blissfully unaware of the true power dynamic.

The departure Commander Boone, humiliated by the discovery, decides to leave the Martian behind without seeking further proof. The crew returns to their ship, fully aware that their "best friends" back home are actually their alien masters.

The People

Oscar Nance is a world-renowned archaeologist whose intellectual curiosity is matched by his deep affection for his dog. He acts as the team’s bridge to the Martian, using his observational skills to connect the dots between Staang’s anatomy and the pets he left back on Earth. By the end, his emotional bond with Mimsy is permanently stained by the knowledge that their dynamic is a product of an alien power structure.

Commander Boone is a gruff, colorless military general who represents the rigid, authoritative approach to exploration. He is obsessed with facts, military protocol, and the prestige of the mission. When the truth about the Martian invasion undermines his entire worldview and his sense of importance, he becomes visibly deflated and abandons the pursuit of further evidence.

Staang is the last of his kind on Mars, a creature who has spent centuries waiting for Earthmen to arrive. He is lazy, cynical, and deeply amused by the irony of his situation. He serves as the story’s narrator of history, possessing a dry wit that highlights the absurdity of human devotion to their canine "masters."

Braun, the zoologist, provides the comic relief and a more cynical perspective. He is quick to see the humor in the situation, laughing at the absurdity of the Martian’s appearance and the irony of the invasion.

In Its Own Voice

"The long trip back to Earth from Mars wouldn't be at all dull. It might well be one long delicious chuckle over a great, grim and incredible joke."

Nance reflects on the irony of the situation as he prepares to return home to his dog.

"You see, we Martians have another name for your Earth. We call it Agar. Your world is the one my ancestors invaded thousands of years ago."

Staang explains to the crew that humanity has been living under an alien occupation for millennia.

"You call us 'Man's Best Friend,' I believe."

Staang confirms that the very phrase humans use to describe dogs is, in fact, the punchline of a multi-thousand-year-old intergalactic prank.

What It's Really About

The story functions as a satirical critique of the human penchant for self-importance and anthropocentrism. By depicting the dog—a symbol of loyalty and subservience—as a master-class invader, it asks uncomfortable questions about what truly defines power and servitude. The narrative explores the idea that history is often stranger and more humiliating than humanity can fathom, suggesting that our most cherished institutions and relationships might be based on misconceptions. Ultimately, it is a dark meditation on how easily one can be manipulated into slavery through comfort and affection, and how the "civilizing" influence of a dominant culture is often just a facade for a deeper, more selfish agenda.

Why Read It Today

Readers who enjoy the classic "Golden Age" science fiction style—characterized by brisk pacing, high-concept twists, and a cynical, dry sense of humor—will find this a quick and thought-provoking read. It feels like a vintage Twilight Zone episode, prioritizing a single, mind-bending irony over complex world-building.

However, readers should be prepared for the mid-century tone, which includes some period-typical gender assumptions; the crew is noted as being entirely male, and the dialogue reflects a 1950s sense of military and academic hierarchy. The prose is utilitarian and direct, focusing almost entirely on the mechanics of the plot and the big reveal rather than deep character interiority.

What stays with you is the final image of the returning astronauts. The story effectively turns the reader’s relationship with their own pets into a source of suspicion and amusement. If you appreciate short stories that challenge your perspective on domestic life with a sharp, unexpected jab at human ego, this will linger in your mind long after the final page. It is a playful reminder that we are not always the protagonists of our own history, even within the confines of our own homes.