Si goes back to 19th century New York to solve a crime and (of course) fall in love.

This is Janet’s favorite time-travel novel, in which Finney elaborates on themes that were set in earlier stories such as “Double Take.”

With eleven years of marriage behind them, Ted and Alice’s fantasies frequently start with a time machine and end with killing one or another of their spouse’s ancestors before they can procreate. So naturally, they each end up at Temponautics, Ltd. Oh, and Ted’s grandpa has some racy fantasies of his own.
In Silverberg’s Something Wild Is Loose (Vol. 3 of his collected stories), he posits that this story is “probably the most complex short story of temporal confusion” since Heinlein’s “By His Bootstraps” (1941) or “—All You Zombues—” (1959), but I would respectfully disagree. In particular, I would describe Heinlein’s two stories as the most complex short stories of temporal consistency in that there is but a single, static timeline and (in hindsight) every scene locks neatly into place within this one timeline. By contrast, Silverberg story involves multiple time travel choices by the characters in what I would call parallel universes. The confusion, such as it is, stems more from what appears to be alternate scenes in disconnected universes rather than temporal confusion per se.

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, . . .

In the first of six (really!) Trancer movies (plus a “lost” short), heroic trancer-hunter (and newly anointed time cop) Jack Deth follows evil trancer-maker Martin Whistler from 2247 to 1985 via drug-induced time-travel that can take you back only to the body of an ancestor.

After the death of his wife and child, Dr. Scott McKenzie stumbles upon a tintype photograph from the Old West showing three corpses, a shooter, and a modern Magnum 357, leading him to develop a theory of time travel that is confirmed when a beautiful woman from the future appears and takes him back to the Old West to chase the shooter, save President Cleveland, and pursue other obvious plot developments.

Spoiler: At the end, I believe that Georgia uses her time crystal to send Scott back for a do-over on the day of his family’s death. This is disappointing since up until that point, the film has set up a perfect example of a single, nonbranching timeline.

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.

Finney’s sequel to Time and Again initially finds Si Morley living a happy life in the 19th century with his 19th century family, while The Project in the future never even got started because he prevented the inventor’s parents from ever meeting. But vague memories linger in some of the Project member’s minds, and Morley can’t stay put.

Jameson is a jerk. He pretends to love his mother, with whom he shares a house. He discovers time travel via a Legoland Time Machine and uses it to destroy women who “dumped” him. Yep, this guy is a real “winner.”

When Boris the Animal escapes from lunar prison and returns to 1969 to kill Agent K and expose Earth to attack, Agent J must follow to save Agent K and all of Earth!

Tim and I saw this on Fathers Day Eve in 2012.