The Philadelphia Experiment in Stranger Things: the USS Eldridge, 1943 and Brenner's father
Universe · True or false · 1943
In this article: the legend and what the navy says about it, the letters that launched it, the bridge to Montauk, the prologue of the play, the Nevada experiment, sorting the true from the invented, then, under a warning, what the last episode shows beside the play.
The Philadelphia Experiment is a legend: in 1943, the American navy is said to have made a ship invisible, the USS Eldridge. Stranger Things never names it in an episode, but the play makes it the starting point for Brenner.
The essentials
- The legend: The USS Eldridge, an escort destroyer, made invisible in Philadelphia in late October 1943. A myth, according to the navy.
- Born of: An annotated book sent in late 1955, then the letters of Carl M. Allen, alias Carlos Allende, in 1956.
- On screen: No episode names the Eldridge.
- In the play: The ship's captain is Brenner's father, the only survivor.
- What follows: The Nevada experiment, which wants to redo 1943.
Contents
- The short answer: a legend, a play, no episode
- The 1943 legend: an escort destroyer that disappears
- Where the myth comes from: letters, a book, a film
- 1943 in the play: Captain Brenner, the only survivor
- From the Eldridge to Nevada: the experiment Brenner wants to redo
- The sorting: what comes from 1943, what the play invents
- The last episode, beside the play
The short answer: a legend, a play, no episode
The Philadelphia Experiment is an American legend. In late October 1943, the navy is said to have made an escort destroyer invisible, the USS Eldridge, at the Philadelphia naval yard. The navy denies it. The story, for its part, dates from the 1950s.
No episode names it. On the wiki, the ship appears only in the play. If you have only seen the series, the name means nothing to you.
It enters the universe through the play The First Shadow, on stage in London since December 2023 and on Broadway since April 2025. The prologue takes place on the Eldridge, in 1943. The ship's captain is Brenner's father.
According to Wikipedia, the Duffers told Variety that the play is part of the series' story, and that the last episode points back to it. In late November 2025, Matt Duffer told the same magazine that it is not necessary to have seen it. “They're Easter eggs more than anything.” Two other names follow: Montauk, then the Nevada experiment.
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The 1943 legend: an escort destroyer that disappears
At the Philadelphia naval yard, in late October 1943, the USS Eldridge is said to have been made invisible. In the most widespread version it disappears, reappears for a few minutes in Norfolk, Virginia, more than 300 kilometers away, then returns to its dock. The crew is left with lasting aftereffects: sailors gone mad, frozen in place, or caught in the steel of the hull. The whole thing supposedly rests on an unpublished theory attributed to Einstein.
The ship, for its part, did exist. It is an escort destroyer of the Cannon class, built in Newark, New Jersey. It is launched on July 25, 1943, commissioned on August 27, 1943, and named for a navy aviator killed in the Solomon Islands in 1942.
The log and the war diary show that it did not pass through Philadelphia between August and December 1943. In September 1996, the Office of Naval Research writes that it never worked on radar invisibility, neither in 1943 nor at any other time. That office was created only in 1946. In 1999, former crew members tell a Philadelphia paper that their ship never called there.
An explanation put forward by navy personnel themselves, and favored by the French-language Wikipedia: degaussing. Cables carrying current made a ship undetectable by magnetic mines and torpedoes. Not invisible to the eye.
Where the myth comes from: letters, a book, a film
In late 1955, an anonymous parcel arrives at the Office of Naval Research. It contains a copy of The Case for the UFO, by Morris K. Jessup, annotated in the margins in three shades of blue ink. In January 1956, Jessup receives letters signed Carl Allen or Carlos Miguel Allende. The author says he witnessed the disappearance from a merchant ship, the SS Andrew Furuseth. The French-language Wikipedia, for its part, dates the first letter to 1955.
In 1957, the office shows the annotated book to Jessup. A Texas firm, Varo, makes 127 mimeographed copies of it. The man was real: Carl Meredith Allen, of New Kensington, Pennsylvania, identified by Robert Goerman in Fate magazine in 1980. He will later say he wrote the annotations to frighten Jessup.
In 1979, Charles Berlitz, already the author of a successful book on the Bermuda Triangle, and William L. Moore publish The Philadelphia Experiment: Project Invisibility. The book makes the story known. Stewart Raffill's film, The Philadelphia Experiment, opens in the United States on August 3, 1984. Two sailors from the Eldridge are thrown forty-one years forward, into the very year of the film.
In 1992, The Montauk Project: Experiments in Time comes out, by Preston B. Nichols and Peter Moon. The book presents the Montauk legend as the extension of 1943. Alfred Bielek, who had been claiming since 1989 that he had been aboard the Eldridge, counts among its first witnesses, according to Jacques Vallée cited by Wikipedia. The series, inspired by the Montauk Project, was first called Montauk.
1943 in the play: Captain Brenner, the only survivor
In the prologue, in 1943, the United States runs secret experiments on the USS Eldridge. A force field is supposed to make it invisible and undetectable to the Germans. The ship is sent into another world, where most of the crew is killed by strange humanoid creatures. The wiki dates this prologue to October 28, 1943.
The wiki adds that the Broadway version calls this world Dimension X.
The play keeps the ship, the year, and the aim of invisibility. It changes the rest: it is no longer about Norfolk, but about another world.
The second act takes place in 1959. Brenner takes Henry to the Hawkins lab and tells him about the past. Brenner's father was the captain of the Eldridge, and the only survivor. He came back badly damaged, with a unique blood type. The wiki speaks of a near-vegetative state. In the version summarized by Wikipedia, he reveals the truth to his son only on his deathbed.
The wiki describes another version, the Broadway one. The father survives a long time, diminished, under government watch. A doctor charged with treating him is said to be the defector who comes up later.
The captain has no first name. The series says nothing of this family. In the play, the son's program starts from a father returned from another world. The wiki writes that Brenner devoted himself to understanding the incident.
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From the Eldridge to Nevada: the experiment Brenner wants to redo
In the play, Brenner founds the Nevada experiment to reproduce what happened to the Eldridge. A scientist on the team goes over to the Soviet Union, steals a technology, and hides it in an underground space in Nevada.
Henry Creel, very young, lives right nearby, in Rachel, a real small town in Nevada. The wiki says he is eight. He explores the underground spaces while playing with a spyglass, and the stolen device is triggered. He is carried off with the defector.
In the other world, he comes under the influence of a shadow entity, which the group will later name the Mind Flayer. He comes back after twelve hours, also with a unique blood type, and changed.
Brenner finds him thanks to the spyglass that fell in the underground space. In 1959, he takes him to the lab.
The epilogue, according to Wikipedia: transfusions of Henry's blood have worked on other test subjects. Henry meets Eleven in a room of the lab.
The name of that room, in the play, is Rainbow Room.
Two Nevadas not to mix up. The Nevada experiment, in the play, takes place in the 1950s. The Nina project, in 1986, occupies an old silo in the same state, and that one is on screen.
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1943 The Eldridge
A force field, a ship sent into another world.
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1943 The captain
Only survivor, a unique blood type.
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The 1950s Nevada
His son wants to redo the experiment.
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The 1950s The underground space
A defector, a stolen device, a boy and his spyglass.
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Twelve hours later The return
Henry comes back changed.
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1959 The lab
Brenner tells Henry about his father.
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Years later The epilogue
Henry's blood, and a child in a room of the lab.
The sorting: what comes from 1943, what the play invents
True. The USS Eldridge existed. Commissioned in August 1943, it passes to Greece in 1951 and ends up scrapped in 1999.
False. Invisibility and teleportation. The log and the navy office deny them.
True. The legend is born of a single man, between late 1955 and 1956, twelve to thirteen years after the events it describes.
True. The Montauk legend presents itself as its sequel, and Montauk was the first title of the series.
Invented by the play. Brenner's father, the ship's journey into another world, the blood type, the Nevada experiment, the defector.
Absent from the screen. No episode names the Eldridge, the year 1943, or Brenner's father.
Not proven. The room with the colored bands supposedly owes its name to Project Rainbow. The French-language Wikipedia does give that name as another name for the legend. The wiki writes that it seems to have inspired the room, and that it appears in the play. No other source confirms it. It is a fan reading.
The last episode, beside the play
Warning: what follows reveals the end of season 5.
In the sixth episode of the last season, Holly understands that the cap of a spyglass is a map, cut out by Henry as a child. She finds a memory of him, in a mine. A wounded man shouts at the young Henry, “Who sent you?”, then claims he was sent. A gunshot. Henry defends himself and strikes the man with a stone.
In the last episode, Henry opens a case: a fragment of the entity. The man, on the ground, then tells him: “It will consume you. It will consume all.” Will explains why Henry forgot: “It didn't want you to remember.” The connection is already made on the finale page.
Side by side, without concluding. The play: a device stolen from the Nevada experiment, a defector, an underground space near Rachel, twelve hours in another world. The finale: a mine, a wounded man with no name, a case, a fragment. The memory of the mine names neither the man, nor the experiment, nor the Eldridge, and does not say where the mine is. According to the wiki, the man is the defector, and the fragment is material taken from the captain. That is its synthesis, not a scene. One object comes back in both stories: the spyglass.
The last season calls the play's other world the Abyss.
One contradiction remains. In 1986, Henry tells of having found the entity on the other side, after 1979. “I found the most extraordinary thing of all.” The play and the finale place the first meeting in his childhood. Will's line explains it by a hidden memory.
What stays open: according to Variety, on January 1, 2026, Matt Duffer said that a spin-off would come back to what happened in the mine, with an entirely different mythology.
The first title of the series comes back in the epilogue of the finale. They offer Hopper a job as police chief in Montauk. “Montauk's looking for a new chief of police.”
A brick model, a building-block set. A room with white walls crossed by bands of color, from red to purple, a floor edged with tiles. At the back, a dark red oval opening. Below, an open gray floor, filled with dark shapes. The room where the play's epilogue has Henry and a child cross paths.
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Frequently asked questions
What is the Philadelphia Experiment?
A legend: in late October 1943, the USS Eldridge is said to have been made invisible in Philadelphia. It is born in late 1955 and in 1956, from an annotated book and then from the letters of Carl M. Allen.
Did the Philadelphia Experiment take place?
No. The ship's log and the Office of Naval Research deny it. The navy calls it a myth.
Does Stranger Things talk about the Philadelphia Experiment?
No episode names it. The play The First Shadow opens on it.
Who is Brenner's father?
In the play, the captain of the USS Eldridge, the only survivor, with no first name. The series does not speak of him.
What is the Nevada experiment?
In the play, Brenner's program to reproduce 1943, at the origin of what changes Henry. Not to be confused with the Nina project of 1986.
What is the link between the Philadelphia Experiment and Montauk?
The Montauk legend presents itself as its sequel, and Montauk was the first title of the series.
