Next Door, Next World

In Short

When test pilot Major Lance Cooper takes the Cosmos XII on a routine four-week maiden voyage through hyperspace, he experiences a strange sense of splitting into infinite selves. Upon landing back at his base, he expects to marry Carolyn Sagen, the base commander's daughter. Instead, Colonel Sagen arrests him, adamantly denying he ever had a daughter. Lance escapes to uncover a terrifying truth: hyperspace navigation displaces pilots into alternate time-tracks. Desperate to recover his life, Lance steals his ship to search the multiverse for a reality where his love exists.

The Story

The Space Service’s newest interstellar scout ship, the Cosmos XII, stands ready for its inaugural hyper-drive test. Major Lance Cooper eagerly anticipates making history in deep space, bidding a fond farewell to his fiancée, Carolyn Sagen. Though Carolyn suffers from overwhelming premonitions of dread and warns him that returning pilots often come back changed, Lance reassures her with promises of a lavish wedding upon his return in four weeks.

Engaging the hype-drive, Lance suffers intense physical agony followed by a strange psychological illusion: he feels his mind splinter into an infinity of selves, surrounded by hundreds of duplicate ships in the gray void of hyperspace. After twenty-eight days of routine travel, Lance returns to Earth, eager to reunite with Carolyn.

Instead of a hero's welcome, Colonel Sagen orders Lance arrested at gunpoint. When Lance asks for Carolyn, the colonel coldly insists he has never had a daughter. Locked in the guardhouse, Lance faces stonewalling and silence. Refusing to accept the situation, he overpower his guards, steals a weapon, and escapes in a patrol jeep to the colonel's residence. There, he finds Mrs. Sagen acting strange, the home refurnished, and Carolyn's pictures missing. Hearing Mrs. Sagen call the authorities to report a erratic pilot, Lance flees to the Officers Club. When the bartender denies knowing him or accepting his drink chits, Lance flies into a rage until military authorities and a space psychiatrist surround him.

Colonel Nordsen, a specialist in hyperspace medicine, finally reveals the truth: hyperspace travel causes "Infinite Fission," sliding ships into parallel time-tracks. Lance has materialized in a neighboring universe where Colonel Sagen remained childless. Devastated, Lance realizes the Space Service covers up these slippages to prevent panic and keep pilots volunteering.

Refusing a discharge or medical isolation, Lance pulls his stolen pistol on the officers, forces Colonel Sagen to clear him for takeoff, and blasts off in the two-thirds-fueled Cosmos XII. He navigates back through hyperspace, gambling that another jump might bring him to a world where Carolyn exists.

Eight weeks after his initial departure, Lance arrives at a third Earth. Ground control expresses shock over his transmission, but confirms Carolyn Sagen is alive and expecting him. Upon landing, Lance rushes into Carolyn’s arms in a tearful reunion. However, his triumph turns to horror when Carolyn sob-confesses that she does not care if he is an alternate version of her lover. She reveals that in this universe, Lance's ship crashed during takeoff two months ago, and they buried his body two days later.

How It Unfolds

The launch into the unknown Lance Cooper bids goodbye to his fearful fiancée, Carolyn Sagen, before taking the Cosmos XII on its maiden hyperspace run. During the drive's activation, he endures agonizing physical stress and a jarring sensation of his psyche splitting into infinite duplicate selves.

A cold homecoming Landing back on Earth after four weeks, Lance is immediately arrested by Colonel Sagen, who reacts with hostility and flatly denies ever having a daughter. Confined to the base guardhouse without answers, Lance realizes something has gone horribly wrong with reality.

Breaking out for answers Determined to find Carolyn, Lance overpowers his cellblock guards, steals a sidearm, and drives a jeep to Colonel Sagen's home. Finding the house altered, Carolyn's photos missing, and Mrs. Sagen calling the police, he flees to the Officers Club, where he is surrounded by military officials and a psychiatrist.

The nature of hyperspace Colonel Nordsen explains the concept of "Infinite Fission," revealing that hyperspace jumps shift ships into alternate time-tracks. Lance has arrived in a parallel world where Carolyn was never born, a truth the Space Service hides to keep pilots from abandoning the program.

Stealing back to the stars Unwilling to live in a universe without Carolyn, Lance holds the officers at gunpoint and forces Colonel Sagen to authorize his launch. Re-boarding the Cosmos XII, he takes off into hyperspace once more, gambling his life on finding a world where she lives.

A tragic reunion Reaching a third Earth, Lance contacts base control and learns that Carolyn is alive and waiting. Upon landing, they embrace, but Carolyn reveals through her tears that her world's version of Lance died in a takeoff crash two months earlier, leaving him to replace a dead man.

The People

• Major Lance Cooper: A dedicated, ambitious Space Service pilot who dreams of deep-space exploration. His utter certainty in his luck and training crumbles when hyperspace destroys his reality, driving him to fanatical lengths to find the woman he loves.
• Carolyn Sagen: Lance’s devoted fiancée, whose deep-seated intuitions and fears about the hidden dangers of hyperspace prove tragically accurate.
• Colonel "Hard-Head" Sagen: Lance’s pragmatic, stern commanding officer. In the primary timeline, he is a supportive prospective father-in-law, but in the second, he is a rigid enforcer who views Lance as an unhinged liability.
• Colonel Nordsen: A calm, analytical psychiatrist from Headquarters specializing in hyperspace medicine. He acts as the voice of authorityAcross the infinite iterations of parallel existence, human longing proves both an unyielding anchor and an agonizing trap.

In Short

A seasoned space pilot returns from a routine four-week jump through hyperspace, only to discover that his familiar world has subtly vanished. Standing on the tarmac of his home base, he finds his superiors treating him like a lunatic and his fiancée erased from reality altogether. What begins as an unsettling administrative nightmare spirals into a desperate flight across parallel dimensions. Exploring the psychological toll of deep-space transit and the fragile nature of personal identity, the story endures as a sharp, atmospheric tale about the emotional cost of seeking a home that may no longer exist.

The Story

Major Lance Cooper stands beside the Cosmos XII, the Space Service’s newest interstellar scout ship, preparing for his maiden solo voyage into hyperspace. He is driven by professional pride and deep affection for Carolyn Sagen, the daughter of his commanding officer, Colonel "Hard-Head" Sagen. As ground crews complete final checks, Carolyn visits the launch pad. She expresses a profound, unsettling intuition that the trip will change him, noting that previous hyperspace pilots returned noticeably altered or vanished entirely. Lance reassures her, promising a lavish wedding upon his return in four weeks, before strapping into the cockpit and initiating the jump.

The transition into hyperspace is physically agonizing, inducing severe nausea and a surreal sensory phenomenon Lance experiences as "Infinite Fission," where his consciousness feels shattered into countless simultaneous selves. Out in the gray void, he sees endless mirror images of his vessel arrayed across the vacuum. He completes the assigned path to a distant star system and navigates the four-week return trip without mechanical failure.

Upon touching down at his home airfield, Lance is met not by a welcoming committee, but by an armed security detail. When he casually asks Colonel Sagen about Carolyn, the colonel sternly denies ever having a daughter and orders Lance arrested. Confined to a guardhouse cell and denied any basic information, Lance overpowers an officer, escapes the brig, and steals a jeep to investigate. He drives directly to the colonel’s residence, where he finds Mrs. Sagen altered in appearance and the family home rearranged, devoid of any photographs of Carolyn. When she secretly calls the military police, Lance flees to the base officers' club, only to find the bartender denying simple shared memories and basic club procedures.

Cornered at the bar by Colonel Sagen, base staff, and an army psychiatrist named Colonel Nordsen, Lance is finally given an explanation. Nordsen reveals that transit through hyperspace causes severe dimensional slippage. Lance has not returned to his original reality; instead, he has materialized in an alternate time-track where Colonel and Mrs. Sagen were childless. Refusing to accept a life without Carolyn or to submit to institutionalization, Lance pulls a concealed sidearm, forces Colonel Sagen to authorize a launch clearance, and hijacks the Cosmos XII back into hyperspace.

He executes another jump, risking everything to find a universe where Carolyn exists. Returning to Earth eight weeks after his initial departure, he establishes radio contact with traffic control. To his immense relief, the operators recognize his name and confirm that Carolyn Sagen is alive and waiting. Yet, when he lands and embraces her on the apron, her desperate relief carries a horrific revelation. She confesses her love for him, admitting she does not care if he is a duplicate from another reality, because the Lance Cooper of her time-track crashed on takeoff eight weeks prior, dying instantly in the wreckage just yards from where they stand.

How It Unfolds

The threshold of deep space Major Lance Cooper bids farewell to his anxious fiancée, Carolyn, beside the Cosmos XII before initiating his first journey into hyperspace. During transit, he endures severe physical disorientation and harrowing visions of duplicate ships alongside his own.

An alien homecoming Lance lands smoothly after four weeks, but his commanding officer, Colonel Sagen, denies having a daughter and has Lance locked in the military brig. Cut off from all information, Lance realizes the base staff are concealing a terrifying secret.

The desperate search for truth Breaking out of his cell, Lance sneaks into Colonel Sagen's quarters, finding a altered family home stripped of Carolyn's presence. He flees to the officers' club, where even the bartender fails to recognize basic shared details of their past acquaintance.

The nature of the slip Surrounded by base officers and a military psychiatrist, Lance learns that hyperspace travel shifts pilots into parallel time-tracks. Informed that Carolyn was never born in this specific universe, he refuses to accept his fate and hijacks his starship at gunpoint.

A tragic reunion Lance completes another hyperspace jump, landing in a universe where Carolyn is alive and waiting at the airfield. As they embrace, she tearfully reveals that her original Lance died in a catastrophic launchpad crash two months earlier.

The People

• Major Lance Cooper: A dedicated, ambitious interstellar pilot who prides himself on his luck and navigation skills. His drive to return to the woman he loves pushes him to defy military authority, hijack a starship, and gamble his sanity against the unknown geometry of hyperspace, only to be confronted by the eerie limits of his own identity.
• Carolyn Sagen: The perceptive, emotionally candid daughter of Lance's commanding officer. Driven by a ominous intuition regarding the dangers of deep space, her devotion to Lance transcends dimensional boundaries, though she is ultimately left grieving one version of her lover while embracing another.
• Colonel "Hard-Head" Sagen: The stern, by-the-book commander of the space base. In one universe, he is a prospective father-in-law who respects Lance; in another, he is a childless, unyielding military administrator willing to declare returned pilots classified threats to preserve institutional security.
• Colonel Nordsen: A calm, analytical psychiatrist from Headquarters specializing in hyperspace medicine. He acts as the dispassionate voice of authority, tasking himself with breaking the reality of dimensional slippage to displaced pilots while protecting the Space Service's recruitment efforts.

In Its Own Voice

Inside him burned a hunger, too. Hunger, and another emotion--pride.

Before embarking on his maiden run, Lance stands in the shadow of the control bunker, consumed by his long-held dream of commanding an interstellar scout ship beyond standard planetary orbits.

Out there in the colorless vacuum, hundreds of replicas of the Cosmos XII rode along beside him, above him, below him, stretched out in all directions.

Crossing the threshold into hyperspace forces Lance to confront an unsettling visual phenomenon that hints at the vast network of parallel realities coexisting alongside his own vessel.

"Your path, evidently, warped to a track several million or billion worlds further over than anybody from your world had previously experienced."

During his interrogation, Colonel Nordsen delivers the cold mathematical reality of Lance's displacement, explaining that his navigational slip has severed him completely from his original baseline reality.

What It's Really About

Beneath its interstellar trappings, the story functions as a psychological exploration of displacement and the terrifying fragility of context. It questions what truly constitutes a person's life—whether home is a physical location, a set of verifiable facts, or the shared memory of mutual relationships. The narrative treats space exploration not as a heroic conquest of foreign terrain, but as an existential hazard that unravels the traveler's baseline reality. Through Lance's stubborn refusal to accept his original displacement, the plot critiques the military-industrial complex's willingness to sacrifice individual human lives and mental sanity for scientific progress, while highlighting the tragic impossibility of ever truly retracing one's steps once the fundamental boundaries of existence have been breached.

Why Read It Today

Readers drawn to classic mid-century speculative fiction will appreciate this narrative for its tight pacing, crisp atmosphere, and focus on psychological dread over mechanical exposition. Rather than relying on technical jargon, the prose emphasizes the claustrophobic anxiety of an individual trapped inside an indifferent administrative machine that insists his memories are delusions.

The story moves with relentless momentum, framing the expanse of the universe not as an open frontier, but as a dizzying labyrinth of subtle variations where a single step out of line erases a life. Its depiction of service life feels grounded and pragmatic, grounded by authentic procedural details of military routine and flight prep. While the narrative reflects the straightforward gender roles and pulpy dialogue typical of 1960s magazine fiction, its core emotional dilemma remains sharp and persuasive. It leaves the reader with a lingering, haunting question about whether finding an identical shadow of what was lost can ever truly heal the grief of losing the original.