When the U.S. is attacked with monsterous submarine/aeroplanes by the demagogue Moyen, it's up to Professor Mariel to find a way to save the country, possibly even through the manipulation of time itself!

You’ll need some patience with “Coils of Time," seeing as how it takes the hero, Rutherford Bohr Adams, twenty-some pages before you’ll realize that the story is a sequel to “The Sands of Time,” and it’s going to fall to space pilot Adams to travel through the 60-million-year coils of times into the future and the past, saving Earth from the evil Martians and their zombies, while also saving his own boss’s beautiful daughter from a fate worth than death.

Years ago, engineer Bill Webster abandoned Earth for the employ of the piratical Astrarch far beyond the orbit of Mars; now the Astrarch is aiming the final blow at a defeated Earth, and Bill wonders whether the gun sights he invented can spot—and change!—events in the past.

First the Soviets and the Westerners fought. Then the Westerners brought Schonerman’s killer robots into the mix. Then the robots fought both human sides. You know all that from Dick’s earlier story, “Second Variety.” But now it’s long after the desolation, long enough that Caleb Ryan and his financial backer Kastner are willing to bring back the secret of Schonerman’s robots from the past to make their world a better place for surviving mankind, including Ryan’s visionary son Jon.

The Traveller now has a name—H. George Wells (played by Rod Taylor)—and Weena has the beautiful face and talent of Yvette Mimieux.

In a world made uninhabitable by the Third World War, a prisoner is chosen as being the only person with vivid enough memories of the past to travel through time and return with salvation.

This 28-minute photo montage with about 1,200 words of narration has a nice seed of an idea, but I find it insulting to other talented filmmakers that Time magazine ranked this sketch of a film as #1 in their 2010 list of best time travel movies.

Hugh Farnam makes good preparations for his family to survive a nuclear holocaust, but are the preparations good enough to survive a trip to the future?

In his blog, Fred Pohl wrote about how Heinlein’s agent gave permission for Pohl publish the novel in If and to cut “five or ten thousand words in the beginning that were argumentative, extraneous and kind of boring” (and Pohl agreed to pay full rate for the cut words). But apparently, Heinlein “went ballistic” when he saw the first installment, so much so that when the book appeared as a separate publication, Heinlein made sure people knew who was responsible for the previous cuts by adding a note* that “A short version of this novel, as cut and revised by Frederik Pohl, appeared in Worlds of If Magazine.”

* The version of Heinlein’s note that Pohl recalled was much funnier than Heinlein’s actual note in our timeline, but sadly, we have lost track of where we saw Pohl’s version.

Using their time viewer, three scientists see a desolate landscape 107 years in the future, at which point the electrician realizes that the viewer has unexpectedly become a portal. All four jump through, only to have the portal collapse behind them, whereupon they are chased on the surface by Morlockish creatures who are afraid of thrown rocks, and they meet an advanced, post-apocalyptic, underground society that employs androids and is planning a generation-long trip to Alpha Centauri.

The film draws in at least four important additional time travel tropes: suspended animation, a single nonbranching, static timeline (with the corresponding inability to go back and change it), experiencing the passage of time at different rates, and a trip to the far future. And according to the SF Encyclopedia, the film was originally conceived as a sequel to the 1960 film of The Time Machine.

The writer, David L. Hewitt, took chunks of plot and script from The Time Travelers (1964), swapped the blonde for a brunette, swapped the accidental time gate for an accidental time rift that drags the whole lab through time as if it were a time ship, added a anachronistic dinosaur, and ended up with an unwatchable movie.

Like the 1964 version, this version has a brief mention that it’s impossible to change events that have already happened, but unlike the original, the montage at the end of the film is mere chaos that no longer reinforces the idea of a single deterministic, nonbranching timeline. Despite that, I enjoyed the consequences of the villainous character running into himself, but at the same time, I dismayed at the discussion of how meeting yourself could instantly cause a disastrous explosion or implosion or maybe something-or-other (the audio was unintelligible at 1:12) would cease to exist. (I pray that the space-time continuum wasn’t in peril).

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, . . .

When terminatoresque cyborgs attack a future Australian city (headed by Quantum Leap’s favorite scoundrel, Dean Stockwell, and defended by everyone’s favorite princess, Carrie Fisher), the scientists take them all back to 1988—a fine plan until the evil cyborgs follow.

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.

A teenage boy opens a Christmas present that takes him from 2017 to 2047 where he meets two antisocial teens, learns of a future war, and has a confused end to his trip.

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.

Young genius Han Tae-sul is the focus of dangerous people and a mysterious woman—Gang Seo-hae—from a war-torn near future.

Sadly, the story comes close to being a slick static timeline, but alas, the writers could not follow through.

Forty-year-old high school biology teacher Dan Forester is drafted for a seven-day tour of the future where he must fight what seems to be a losing cause in the war against bug/T-rex aliens.