I’d bet my last złotych that Lem is carefully satirizing the rule of the Polish United Workers’s Party in this story of a fourth-millennium man who hails from Mars and has room in his brain for two or three different personalities (Kazimierz Nowak, Hipperkorn, and possibly a dreaded Nanów), the first of which leapt from a touring chronobus in the 20th century where he hoped to find the inventor of time travel, Professor Tarantoga.

A group of secretive scientists develop time travel near Idaho’s Craters of the Moon, discovering a near-future apocalypse. Since anyone much over age 20 can’t survive traveling, they’re in the process of sending a group of young people, including Isa and her withdrawn sister Karen, beyond the apocalypse to rebuild civilization. Things go wrong (not the least of which are the plot, the dialogue, the acting, the sound track, and the requirement that the young Jane Fonda lookalikes must strip to travel through time), but even so, the film has a certain unprepossessing appeal.

Artificially intelligent machines from 2029 send a killer cyborg back to 1984 to kill Sara Connor because, in 2029, her son John will lead the resistance against the machines’ rule.

The story has a classic self-defeating act: The Terminator goes back in time to kill Sara Connor, causing Kyle Reese to follow and become romantic with Sara Connor, causing John Connor to be born and eventually lead the revolution, causing the Terminator to go back in time to kill Sara Connor, . . .

Once more, the machines from 2029 send back a killer cyborg, this time a T-1000 to kill young John Connor in 1995, but Resistance-leader Connor of the future counters by sending a reprogrammed original T-800 to save himself.

In the year 2035, with the world devastated by an artificially engineered plague, convict James Cole is sent back in time to gather information about the plague’s origin so the scientists can figure out how to fight it.

When fourteen-year-old genius Artemis Fowl realizes that the only cure for his mother’s case of Spelltropy lies in a species of lemur that Artemis made extinct eight years ago, there is only one solution: Grab your 80-year-old, elfin-police-captain-friend Holly Short and trick her into traveling back in time to stop your formerly evil, ten-year-old self from killing off the last of the all-cure lemurs.

Author Eoin Colfer does a masterful job presenting a single nonbranching, static timeline, complete with three consistent causal loops (further described in our tag notes for this story). But really, Eoin, you missed the shuttle on “the kiss”! With the help of N°1, Artemis can time travel, so if you're intent on his first romantic kiss coming from Holly Short, couldn’t N°1 have brought Holly’s actual fourteen-year-old self into the story? Might have even presented an opportunity for a fourth causal loop: Fourteen-year-old Holly kissees fourteen-year-old Artemis, but only because fifteen-year-old Artemis had already told thirteen-year-old Holly that they would enjoy it.

Miranda has an odd friend named Marcus who knows a lot about time machines, another friend named Sal who has stopped hanging out with her, and a man—not really a friend—who sleeps under the mailbox out front. And then there are those mysterious notes from someone who seems to know quite a lot, but also needs her to write about everything that’s happening in her twelve-year-old life.

Teenager Prenna James and her mother are two of the survivors of a future plague who return to the early 21st century to live out a quiet life under strict non-interference rules.

While on medical leave for his mental health, police detective Darius Lafaux is called back in to investigate a case that turns into multiple murders of men who look exactly like himself.

Secret police agent Kamal teams with his sister-in-law Nisreen, fleeing through time from pursuing gunmen who killed Nisreen’s family because toprotect the secret that their world was created by a violent temporal disruptor who altered history in favor of an autocratic Islam theocracy.

After the excitement of T2, you’d have thought that Sarah Connor and her son John could have settled down for a well-deserved, peaceful life. But, no: First a leftover T-800 Model 101 Terminator kills young John, and then 20 years later, Sarah meets two new characters—young Dani Ramos and an enhanced woman from the future—who are running from a new kind of terminator built by a new kind of Skynet. Certainly a fun T-romp, cast in the mold of T2, but really?!, if those johnny-come-lately millennial writers wanna live, they can’t be messing with the come-with-me line.

The setting is necessarily vague, but it seems that in the future, doctors may recommend limited time travel to seek closure for a lost personal relationship.