Trapped in the Past

Sometimes, the Time Traveler never intends to go anywhere. He's just minding his own business when an Alien Space Bat sweeps him into the past without any hope whatsoever of ever getting back home.

Once the initial excitement has faded, and he has resigned himself to the situation, there's nothing for it but to do the best he can in his new world, or die trying. How much the unwilling traveler can achieve depends on how far back they are swept, and how well prepared they are.

If they land in the recent past, they typically use their foreknowledge to try to gain a comfortable life. Interacting with their immediate ancestors is a great temptation and they can hope to live until their original time. The really unlucky travelers end up in the path of war or disaster - on the Titanic, during the last days of Pompei, in medieval England with the Black Death raging - in which case, the plot will be about escaping the immediate peril.

At the other extreme, they are lucky enough to have in depth knowledge of the time period they're stuck in, extensive engineering skills, or both, making them the ideal people to bring progress to the past. After some initial teething troubles, the industrial revolution is soon in full flow, several centuries early, allowing the traveler half the comforts of home.

The middle ground of travelers, those who avoided immediate disaster but didn't have the foresight to learn the right things, have to accommodate themselves to the past. They may be able to improve their life in little ways, but for the most part they are stuck with the dismal realities of history.

This trope typically ignores the implications of language and biology. Individuals who find themselves transplanted in the Medieval period are able to communicate without difficulty with people whose language bears very little resemblance to their own (for example, middle English is not the same as modern English, and so forth). Furthermore, those same individuals never have to worry about the disease or poor hygiene practices that made living during those ancient periods extraordinarily hazardous, by modern standards. Likewise, they never have to worry about infectious diseases common in their own time spreading wildly among a population with no immunity, the way that smallpox and other plagues spread in the New World after Europeans showed up.

Well, hardly ever. Aversions and subversions of those parts of the trope are increasingly popular.

The original victim, Hank Morgan of Mark Twain's A Connecticut Yankee in King Arthur's Court, failed to permanently industrialize Arthurian Britain and was sent back to the nineteenth century as mysteriously as he'd left it (incidentally making this Older Than Radio). Most of his successors, however, have had better luck.

When the phenomenon takes place on a collective scale (say, an entire city rather than a single person), it's an Island in The Sea of Time.

A Sub-Trope of Fish Out of Temporal Water. Compare Get Back to the Future, Trapped in Another World, and Summon Everyman Hero.

Anime and Manga

 * Jin (manga): The title character, a present-day Japanese doctor, is sent back in time to the end of the Tokugawa Era.
 * Rave Master: is trapped fifty years in the past, and makes sure not to interfere with the upcoming history to occur. However, he does end up setting up a Stable Time Loop and pulling off a gambit to call for aid in time for the final battle.
 * To a Distant Town: Middle-aged Salaryman Hiroshi finds himself back in the body of his 14-year-old self, in the early 1960s.
 * The anime and manga Zipang sends the Japanese Maritime Self Defense Force vessel Mirai, an advanced version of Kongo class destroyer (in turn a modified version of the American Arleigh Burke class destroyer), back to just after the Battle of Midway. Similar to The Final Countdown, where a Nimitz class aircraft carrier gets sent back to just before the attack on Pearl Harbor, but much better done.
 * Rumiko Takahashi has used this, in Fire Tripper---a modern Japanese girl finds herself swept back in time to feudal-era Japan. But not all is as it seems at first...
 * In Amakusa 1637, seven teenagers from a Catholic school get trapped in the Japan of few before the sakoku ("isolationism") period. They learn that they're in the Amakusa area, right before the Shimabara Rebellion, and they decide to try averting the bloody massacre of Japanese Christians.

Comic Books

 * The Marvel 1602 mini-series has a time-displaced Captain America (comics) sent back to Elizabethan times. When asked to return to the future, he insists on staying to try and build a better America from the beginning—which he does in small ways, such as helping a group of colonists survive a winter that should have wiped them out, or warning the natives against selling their land to unscrupulous capitalists. The final touch comes when, because of his actions, the American colonies declare independence from Britain 174 years early.
 * And it's got dinosaurs.
 * It also has consequences beyond his control—his presence causes the Marvel Universe to impose itself on the past, and period versions of the X-Men, Avengers and other superheroes start appearing.
 * Sasmira: A young couple from the present day somehow find themselves sent back to the turn of the 20th century.
 * Reed Richards was shunted to the distant past by a villain without his gadgets and he wasn't rescued until much later when his teammates found out what happened to him.
 * Ultra Boy of the Legion of Super-Heroes was once trapped in the distant past. It took him a while to realize, since he started out stranded on an alien world as well.
 * There have also been several periods where a subgroup of Legionnaires was trapped in their past/our present for a span of issues.

Fan Works

 * This fic in particular has Itachi Uchiha in his dying moment thrown into the past, back to a few months before the Uchiha Massacre. However, in a bit of a twist, his future self and past self occupy the same body, with the future self trying to get the past self to change the course of history.

Film

 * Ash in Army of Darkness.
 * In Back to The Future Part III, Doc Brown resigns himself to the fate of living in The Wild West - and he's actually quite happy about it. He even goes as far as to give Marty instructions to not pick him up. Being an inventor, though, he does manage to invent some technology of the future. He doesn't share his inventions with anyone else, as he's mindful to not risk changing the future. At the end of the film, he does create another time machine out of a stream train. However, it's uncertain whether he chooses to live out the rest of his life in the past - or move back to the future. The Ride and The Animated Series, though, both have Doc ultimately moving back to the future.
 * Picard accepts this fate for the crew of the Enterprise in First Contact, when it appears that they may not be able to return to their own time; as he prepares to attempt to rescue Data from the clutches of the Borg Queen, he gives the order that if he doesn't return, they should pursue happiness in this era.

One person

 * Poul Anderson's short story The Man Who Came Early, in which an American soldier stationed in Iceland is sent back to the Viking Era after being hit by lightning. Luckily the Icelandic language has not changed much since then. All his attempts to change history fall flat on their face. When he tries to show the Vikings how to make compasses, he has no idea where to find or mine magnetic ores. When he tries to show them how to build more modern sailing vessels, the Vikings point out that such vessels are too cumbersome to dock anywhere where there is not a ready built harbor, an obvious rarity in that time period. The Vikings find the matches he brought with him impressive, but he has no idea how to make more. The only knowledge he has of any use is modern martial arts. The story's main point is that victims of this trope don't really have much chance of introducing future inventions because most advances are useless without an advanced societal infrastructure to support them.
 * The Axis of Time trilogy by John Birmingham. World War 2.1: Weapons of Choice, World War 2.2: Designated Targets, and World War 2.3: Final Impact. A multinational naval task force from 2021 is sent back to World War II, where it (literally) impacts with the American fleet steaming for Midway. The consequences are extremely far-reaching.
 * The Arthur C. Clarke novel Time's Eye is the extreme form of this, involving Alexander the Great's army, Genghis Khan's Mongol hordes, six people from 2037 (three UN peacekeepers and three Soyuz cosmonauts), and a British outpost from the days of the Raj, with Rudyard Kipling in it.
 * The Cross Time Engineer and sequels by Leo Frankowski. Polish hiker Conrad Schwartz, in a drunken stupor, bypasses all kinds of security and stumbles into a historical-research time portal (created, coincidentally, by his cousin) and awakens in thirteenth-century Poland, where he has just ten years to industrialize and unite his nation before the Mongol hordes arrive and kill everybody.
 * This one has been accused of being one big bit of Mary Sue-starring wish-fulfillment. Bad enough the original publisher dropped him.
 * Language difficulties are handwaved in a justification that "all Slavic languages are pretty much the same." Diseases don't really rear their head until the 6th book, Conrad's Quest for Rubber where they have to deal with unfamiliar diseases in Africa, but is semi-justified by Conrad's cousin going back in time to make Conrad sterile (no, not like that... he's rather prolific, really).
 * Actually, the language issue was specifically addressed, in that Polish (unlike English) had not changed notably since that period.
 * Inverted in The Centurion's Empire by Sean Mcmullan, the premise of which is that Ancient Rome developed a medicine that allowed the human body to survive being frozen, and promptly started storing its best and brightest. After the empire collapsed the one survivor set up shop in an English village, being unfrozen when they needed his military expertise.
 * In Terry Pratchett's short story Once and Future a time traveller called Mervin finds himself not only trapped in the past, but in a past that never existed: the Anachronism Stew that was King Arthur's time. Working as a doctor for a village in Sir Ector's demenses, he quickly realises that what they need is a great and noble leader, gimmicks up an electromagnet to hold a sword in a stone, and waits for a candidate whose body language suggests he's sensible enough to take advice. It works, although not quite how he expected.
 * In Terry Pratchett's Discworld novel Night Watch, Commander Vimes is eventually torn between trying to fix the timeline so that he can get back to his own time, or attempting to improve the Ankh-Morpork of thirty years ago.
 * Nimue Alban's situation in David Weber's Safehold series lacks time travel, but otherwise fits perfectly. Nimue (or rather a Ridiculously Human Robot with her personality) is awoken in the last human world of Safehold, which has been trapped in Medieval Stasis for almost a millennium thanks to its delusional founders. Nimue's objective is to undo this and bring humanity back into the era of space travel. Many details listed in the description are averted, since robots can't get sick, and Nimue has to learn Safeholdian English before she can venture out among its people.
 * Lest Darkness Fall by L Sprague De Camp. Martin Padway is struck by lightning and finds himself in sixth-century Rome, on the verge of its ruin at Justinian's hands and the onset of the Dark Ages. He may be able to save civilization, if he can only get the ruling Goths to grasp the value of his innovations...
 * Brought later full circle with To Bring The Light by David Drake, which is bound with Lest Darkness Fall in some editions. In this story a woman from Justinian Era Rome gets sent back to the founding of Rome and must use the inventions of later Rome to help found it...
 * Temporally inverted in Philip Francis Nowlan's Armageddon 2419 A.D., or as it's better known, Buck Rogers in the 25th Century. Rogers, in the various versions of his tale, brings lost knowledge and a certain 20th-century vitality to future America and/or Earth as a whole.
 * Lord Kalvan of Otherwhen by H. Beam Piper. Pennsylvania cop Calvin Morrison runs afoul of the Paratime Police and is accidentally transported to a medieval alternate Earth where a corrupt theocracy controls the secret of gunpowder. Pretty realistically handled—he knows the basic formula, but also knows that there were steps in making it consistent that he needs to rediscover, and he has to convince wary leaders to build up the entire infrastructure for gun manufacturing from scratch.
 * In Piper's story "Time and Time Again", a World War III soldier suddenly finds himself in the body of his twelve-year-old self. His future knowledge enables him to prevent a murder and convince his father of the truth of his story; the story ends with them beginning a long-range project to acquire enough wealth and power to change history and prevent the war.
 * Harry Harrison's Deathworld 2 features a non-time travel version of this, in which interstellar adventurer Jason dinAlt is stranded on a Lost Colony which has regressed to barbarism. Various bits and pieces of more advanced technology, generally regarded more or less as sorcery, are held as closely guarded secrets by the different clans (one group still knows how to make primitive petroleum-fueled engines, another how to make some crude electrical devices, yet another clan practices alchemy-level chemistry). The hero winds up completely revolutionizing the planet's backwater society solely out a desire to get off that primitive dirtball and back to someplace more civilized. The language issue is avoided as everyone on the planet speaks a (somewhat degraded) version of Esperanto.
 * The Other Time (started by Mack Reynolds, completed by Dean Ing after Reynolds' death) features a modern day (1980's) anthropologist doing field work in Mexico who gets thrown back in history to just the right time to run into Cortez and the conquistadors. The language issue is avoided as the hero (being an anthropologist) naturally speaks Nahuatl and Spanish.
 * The Dechronization of Sam Magruder by George Gaylord Simpson—Sam Magruder, a scientist, is accidentally sent back to the dinosaur era by an experiment. The novel is in the form of his diaries, carved in stone, concerning how he copes with being stuck in the past, alone, for the rest of his life.
 * Arthur and Ford find themselves trapped on prehistoric earth, the only skills between them the ability to live in a crapsack universe. They're unable to communicate with the aborigines, an odd aversion since their babel fish allow them to communicate with all the rest of the known universe, including the interplanetary immigrants they are marooned with.
 * Robert Heinlein's The Door Into Summer speculates that Leonardo da Vinci may have been a Leonard Vincent who attempted to time travel 500 years.
 * This can happen in the Time Scout series. A Portal to the Past can become unstable and vanish, trapping people on the other side. Or you can go through a temporary unstable gate and get trapped. This happens once in the series, and a few times in back story.
 * Jayfeather from Warrior Cats finds himself stuck in the time of the Ancients twice. He manages to leave both times.

A group or community is transplanted.

 * Island in The Sea of Time by S.M. Stirling. The island of Nantucket is whisked into 1250 BC, and must contend with Bronze Age cultures and their own crop of power-hungry renegades. This one does contend with language difficulties, uptime diseases, and so forth; the Nantucketers manage to wipe out huge numbers of Native Americans before they even realize what's going on, because the first party sent to the mainland contains someone with a sniffle. Their language difficulties are moderately eased by the fact that the languages of Europe are, at that point, much closer to still being "Proto-Indo-European"...
 * The Assiti Shards milieu by Eric Flint and others. Cast-off shards of transdimensional alien "art" bombard Earth and transpose large chunks of it with other times and places. Several alternate histories are planned in this meta-setting, including Time Spike (several separate Shard events deposit a modern maximum security prison, the Cherokees on the Trail of Tears, a band of conquistadors, and multiple pre-Columbian Indian settlements into the Cretaceous), 1776 (the armies of George Washington and Frederick the Great both find themselves in ancient Rome during the Crisis of the Third Century), and By Any Other Name (the Assiti themselves make unwilling contact with Elizabethan England), but only two has seen any publishing. The first one has, however, seen a lot:
 * 1632 and many, many sequels. The West Virginia coal-mining town of Grantville is translocated to southern Germany in the middle of the Thirty Years' War, utterly shattering the power structure and world view of Reformation Europe. Once again, this setting deals with language and diseases fairly well. Although in this case, it's the uptime people of Grantville who have to worry about the risk that the pandemic plagues of the 1600s will devastate their community. On the bright side, they're at a recent enough point in the past that their English is recognizable in England, and their German-speakers are understandable to the Germans around them.
 * Parodied repeatedly in this short story (scenario 6).
 * Jon Scieszka's Time Warp Trio series.
 * In Dinoverse, the four eighth-graders sent back in time and put into the bodies of various megafauna aren't stuck; they know that if they reach a certain place and are there at a certain time there's a chance that they can make it back. But one of them, Janine Farehouse, would rather be stuck, so she abandons the group to try and live as a Quetzalcoatlus. A native Quetzalcoatlus hangs around her and she does fairly well for a few days, before the thought of never having anyone to talk to softens her resolve enough that one of the other kids can persuade her to help them find the place.

Live Action TV

 * Life On Mars: Sam Tyler, a policeman from 2006, mysteriously wakes up in 1973 and does indeed have problems communicating with his police colleagues.
 * Even though they speak the same language, they don't speak the same language, if you know what I mean.
 * Also, obviously, the spin-off/sequel Ashes to Ashes, Alex Drake from 2008, finds herself trapped in 1981 with a perm and a wardrobe full of jumpsuits.
 * Lost:
 * Doctor Who's infamous "Blink" has the Weeping Angels do this to people.
 * It almost happens to the Doctor in "The Girl in the Fireplace." Luckily for him,
 * Arthur Dent and Ford Prefect end up stuck on prehistoric Earth with the idiotic Golgafrinchans at the end of the Hitch Hikers Guide to The Galaxy. In the earlier radio series they were rescued when Arthur's towel become fossilised and picked up by the Infinite Improbability drive in the future, and in the third book of the "trilogy", some other sort of phebotinum came to the rescue.

Magazines

 * An early '70s National Lampoon had a short story "Going Back" where a guy in his 30s wakes up in his childhood home (oddly, he's still his grownup self, but everyone sees him as a kid.) He eagerly goes to school, thinking he'll wow the teachers with his talent and knowledge, but is perceived as merely average. He upsets his teacher when he blurts out that General MacArthur has been kicked out of Korea, forgetting it hasn't happened yet, then launches into a Vietnam-era rant about policing the world, not a smart thing to do in the McCarthy era. He gets grounded by his parents, and gloomily pictures his kid self in the future in his bachelor apartment, watching color tv all night and dropping water balloons off the balcony.

Video Games

 * The plot of Final Fantasy X revolves around Tidus being plucked out of the futuristic city of Zanarkand (while said city is destroyed) and dropped in the world of Spira. He finds that Zanarkand was destroyed 1000 years ago and has no way of getting back, so he helps a summoner on her quest to destroy the local world killing god whale.
 * Fully subverted when we find out.
 * In Back to The Future: The Game,

Western Animation

 * Totally Spies: "Stuck in the Middle Ages with You".
 * The Tick (animation) and Arthur were stuck millions of years ago for quite a while and got mixed up with time-travellers from the future who were exploiting the Australiopithecenes as resort help.
 * Inverted with Samurai Jack. Aku rips open a portal in time and flings the protagonist into the future, where he must find a way to return to the past to undo the temporal damage done by said villain.
 * Young Justice: Bart Allen, the future grandson of Barry Allen, the second Flash, got hit with this at the end of "Bloodlines".