Does the sun still exist at night, or does it die every day? This is the question at the heart of Robert Heinlein’s “All You Zombies—”, where a time traveler experiences his entire life in one work shift before settling down in his cot for a well-earned rest.
This story is one of the greats of the golden age of science fiction that moves huge ideas through a few short pages. It has a relatively slow start, with two guys in a bar talking about their jobs and their lives. One guy is the bartender; the other is an advice columnist who specializes in answering questions from Unmarried Mothers. It doesn’t spoil anything to reveal that the columnist was himself an Unmarried Mother once, which explains how easily he can describe their point of view.
At the core of the story is a question of whether the individual has a concrete value in an ever-shifting universe. Heinlein’s answer, hinted at in the title, is both No, and Yes. “All You Zombies—”’s central premise is that the individual experience is the only one we can have, and yet the self is so malleable that it can be completely transformed by external forces. War, employment, sex and gender are all interchangeable, meaningless and foundational. And yet despite the baseless nature of the self in an uncaring universe, the central figure ends his shift believing only in himself.
“The Snake That Eats Its Own Tail, Forever and Ever . . . I know where I came from—but where did all you zombies come from?”
—Robert Heinlein, “All You Zombies—” in The Magazine of Fantasy and Science Fiction (Mar 1959) 15
In an uncaring universe where the individual is self-creating and permanently fluctuating, who is the Other? Does anything exist outside the Self? If I die, does the whole world? The lonely conclusion of this logic is addressed even within the text, where the protagonist signs off his narrative with: “I miss you.”
“All You Zombies—” is complex enough to survive spoilers, but to enjoy the full experience, it is best to go in blind. Talking about it requires delving into the meat of time travel and paradox, so the rest of the review will feature spoilers.
You’ve been warned!!!
The story doesn’t fall apart at the worldbuilding level, but the inciting incident of the story is superfluous. The premise is that time travel became possible not long after interstellar travel, leading to many different necessary support teams for fifth-dimensional servicemembers. The protagonist, the one true individual we can prove, is one such servicemember of the Time and Space Corps. His story is littered with the acronyms of made-up military organizations and their support structures. There’s the Women’s Emergency National Corps, Hospitality & Entertainment Section (W.E.N.C.H.E.S), a.k.a the Auxiliary Nursing Group, Extraterrestrial Legions (A.N.G.E.L) or Women’s Hospitality Order Refortifying & Encouraging Spacemen, probably the most honest acronym (W.H.O.R.E.S). Space can be lonely, and women are enlisted wholesale in the war effort to prop up male servicemembers psychologically and sexually. Technology is sufficiently advanced that natural beauty is not as important as being fit to endure the stress of the job, but not so much that the work is not gender segregated. Despite the heavy lifting that the phrase ‘women’s work’ does in context, there is an emphasis on the dignity of the work, as a necessity for morale, and as spacers in their own right.
Long before any of this is revealed, the Unwed Mother reveals that he used to be a woman who was interested in taking on one of these roles. He’d never felt beautiful as a woman, but the Time and Space Corps could change anything about him. He would be thrown into the vast frontier of space, rewritten as a different person, and emerge as successful by feminine standards, with a husband in a stable professional career. Before he can apply, a handsome man with ‘a fat wad of hundreds’ takes him out on a few dates, knocks him up, and disappears.
The bartender knows all this already, because he is the Unwed Mother after many long years in the Service, and as he listens to the Unwed Mother he casually organizes the circumstances for his own conception and birth by offering to introduce the Unwed Mother to the cad who left him alone and pregnant. Slipping him a fat wad of hundreds, he sends him through time to meet his pre-transition self, then skips ahead nine months to collect his infant self and dump the child off at an orphanage. Meanwhile, the doctors wake the Unwed Mother up post-labor to inform him of an undescended set of testicles nestled inside his groin. Due to birth complications, they have decided to advance the development of the testes and help him adjust to life in a new gender.
With this one act, the Unwed Mother’s life is destroyed. His original plans to take night classes and join the WENCHES are out of his grasp. The doctors pressure him to put the child up for adoption, a superfluous decision when his future self snatches the baby and dumps it at an orphanage. After his transition, he wanders aimlessly for years, struggling to feel at home in his body, before ambling into a bar for a drink. There, his bartender sets him up with a few dates with his former self before dragging him to the Sub-Rockies Base in 1985 for recruitment. As his shift ends, the bartender closes up for the night, hops to the same Sub Rockies Annex in 1999, downs a bottle of whiskey, and types up his report.
The crux of the story is to create a time paradox scenario where a man could conceive and birth himself, and all the references to military life are trappings to provide a sliver of justification for these actions. The recruiter knows to recruit himself for his own role, and as a bonus, he gets to ensure his own birth, too. To create the effect he wanted, Heinlein ad-libbed from older material and left some of their debris behind.
“All You Zombies—” bristles with the anxieties of post-war America, full of acronymic federal bureaus, new medical treatments for sleep, headaches, moods, and birth control. Medical advances make the body transparent through better anesthesia and X-rays, increasing the availability of plastic surgery. The Space Race punctures the horizon, condoms roll back generational fears of unplanned pregnancies. The story’s heart is a deeply anxious question about the nature of personhood in the face of scientific progress, and included on this list is the question of what makes a man.
When the story is viewed as a question on the nature of identity, it makes sense that Christine Jorgensen’s name would be used to illustrate the protagonist’s intersex condition. Otherwise, the protagonists’ sex organs are the only part of him left to nature. At birth, he just so happened to have both sex organs. His condition is used to form a window through which medical science can dictate his gender, but science itself plays no role in his self-identity. The protagonist is characterised as being remarkably easy-going and level-headed. While he is clearly aimless and depressed after the loss of his daughter-self, he’s quite comfortable in his masculinity. He makes a few jokes about sympathising with women as someone who used to be one, but doesn’t show any regret for his transition. In fact, he balks at threats to his masculinity.
Clearly, these are circumstances that create a cohesive image for Heinlein, who might have struggled to understand news stories about pre-liberation gender transition. Heinlein’s perspective is very normative in centering gender identity in the genitals, with a brief, hand-waved period of months in which the protagonist learns their new social role. In-universe, the protagonist is characterised as being an excellent field agent for his even temperament, implying that anomalies require a degree of gender fluidity. On the other hand, the setup established that girls aren’t allowed in space except as sexual accessories.
This contradiction seems to have crossed Heinlein’s mind long enough for him to envision a space future in Starship Troopers with a fully integrated infantry unit. If it’s supposed that Starship Troopers takes place along the same spacetime continuum, long enough for America to find an enemy amongst the stars, then the mood stabilizers, plastic surgery, and birth control have crafted a society with gender equality that conforms neatly to heterosexual standards.
For Heinlein, gender equality is something that needs to be forged in flesh, cut and synthesized into a physical ideal. That wasn’t unique to him. The golden age of science fiction delighted in using the mind as a tool to shape the world in a playground with practically no friction between a problem and its solution. Science fiction acted as the drafting stage for a design patent and its practical application.
Heinlein, as the story’s ultimate authority, in the story asserts himself a few times, most notably in the central premise that the space frontier will immediately lead to exploring time. Or that the United States would be the leader of that technological revolution, though in Heinlein’s defense, Americans who didn’t believe that were put on a list. More unique to Heinlein is the proud assertion that anyone would sleep with themselves if given the chance. There’s no way to be sure about that, but it’s necessary for the story, and Heinlein seems to believe it. Therefore, it is true. But would Heinlein’s protagonist sleep with himself as a man, or only a woman? If not, why not?
Heinlein’s use of an intersex person with an incredibly rare case of chimerism interrogates the limits of heterosexual expectations without abandoning them, like an astronaut tethered to a ship through his oxygen tank.
But Heinlein’s vision still centers a biological assignment that can be made by doctors on an operating table without the patient’s input. That someone’s sense of self can be altered for life in just a few months of training, given our current political climate, seems unsettling. Heinlein’s use of an intersex person with an incredibly rare case of chimerism interrogates the limits of heterosexual expectations without abandoning them, like an astronaut tethered to a ship through his oxygen tank. The umbilical cord of binary sex and gender lashes the story to simplistic modes of social graces even while it threatens to strike out on its own. The real question “All You Zombies—” asks: is anybody out there on the other end of this leash? Who are you people? Will you still be there in the morning?
“All You Zombies—” (1959) by Robert Heinlein may be read for free at the Internet Archive.
O. F. Cieri is based out of NYC. In 2013 she won first place in BMCC’s Poetry Competition. In 2016 she won an Honourable Mention in LaborArts Make Work Visible Competition. Her non-fiction has been carried by Hyperallergic and the Invisible Oranges. She published her first book, Lord of Thundertown, with Ninestar Press in 2020. In February of 2023 she published her second book, Lockdown Laureate, with Castaigne Publishing. Her third book, Backmask, was published by Malarkey in June of 2023. https://ofcieri.com/
Copyright 2026 O. F. Cieri.
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