"Time Will Tell" — An agent of a future neo-fascist global government is sent back to kill a researcher, preventing him from developing force field technology that will allow his government to be overthrown. He brings back a copy of a coffee-stained note with information about the researcher on it. During the course of the episode, Castle and Beckett find the original note, and with the aid of another time traveler, apprehend the agent and save the researcher. At the end of the episode, Beckett spills coffee on the original note, establishing a predestination paradox.
"Morality Bites" (season 2) — after Phoebe gets a vision of burning on the stake in the future, The Charmed Ones travel to the future to prevent it from happening.
"Pardon My Past" (season 2) — Phoebe travels to the past to save her present self from dying after the cousins of her last generation cast a spell on her past evil self to prevent Phoebe from ever living past 29 in any future generation.
"All Halliwell's Eve" (season 3) — Prue, Piper and Phoebe are summoned to the past when their ancestor Charlotte summons them to help her give birth to Melinda, after a gang of evil witches try kidnapping Charlotte to raise Melinda evil when she is born.
"All Hell Breaks Loose" (season 3) — Tempus turns back time after Piper is killed.
"A Knight to Remember" (season 4) — Paige and Leo must rescue Piper and Phoebe, who are trapped in the Dark Ages by Paige's past self.
"Paige from the Past" (season 4) — Paige and Leo travel to the past so Paige can finally mourn over the loss of her foster parents and move on.
"A Witch in Time" (season 5) — Piper goes back in time to prevent a demon of the future from killing her sisters, Paige and Phoebe, but there are consequences and Phoebe must move on after the loss of a loved one.
"Cat House" (season 5) — Phoebe and Paige travel down memory lane after Piper and Leo go to a marriage counselor.
"Chris-Crossed" (season 6) — Chris travels to the future to save Wyatt from turning evil.
"The Legend of Sleepy Hallwell" (season 6) — Phoebe travels to the future via a vision quest to discover that she's pregnant, Paige is a teacher at Magic School (aka Not!Warts) and Piper has two children.
"Ordinary Witches" (season 7) — Paige and Kyle travel to the past so Kyle can figure out who killed his parents, and finally move on, but Kyle's reaction turns out deadly and not as goody goody as Paige expects...
"Charmageddon" (season 7) — the Avatars turn back time from the perfect society, Utopia, to reality again, after Paige, Phoebe and Piper find out all is not as nice as it seems.
"Forever Charmed" (season 8) — Piper and Leo travel to the past and the future for guidance on how to defeat Billie and Christy.
"Ghost Apocalyptic Future" (season 1) — A disturbance in the space-time continuum results in Kylie Griffin switching places with a rebel Ghostbuster from the future, where New York is ruled by a paranormal tyrant called Tempus.
"Bender's Big Score" (direct-to-disc movie)—Scammers are drawn to a tattoo on Fry's buttocks, which is revealed to contain the binary code for paradox-correcting time travel. The scammers have Bender use the code to steal every valuable object in human history.
The End of the Beginning (Season 3) — Autolycus steals the Chronos stone and, with Hercules, accidentally goes back in time five years, during which the Chronos stone is broken. They must now find the current Chronos stone and go back to their time.
"Armageddon Now I & II" (Season 4) — Hope helps Callisto go back in time to stop Hercules from being born. Iolaus gets help from Ares to stop her.
"Once Upon a Future King" (Season 5) — Arthur of Camelot, who is an evil man, is sent back to Hercules' time to learn better ways.
"Honey, They Call Me The Space Cowboy" (season 1) — The family goes back to 1864 to view a comet, but end up helping an alien recover his spaceship from thieves.
"Honey, Name That Tune" (season 3) — Determined to prove the existence of a band called The Bopkas, Wayne Szalinski travels back in time to 1963 - only to discover that The Bopkas are not what they seem.
"Brain of the Future" (season 2) — the mice meet their future selves.
Port Charles: Frank Scanlon time travels from 2001 to 1973 to destroy a computer to prevent himself from communicating with Rhonda Wexler across time, and restoring the life of Karen Wexler, who was erased from existence.
"Xmas Marks the Spot" (season 1) —On Christmas Eve, the Ghostbusters unknowingly stumble through a portal to the past and into 19th century Britain where they run into Ebenezer Scrooge and capture the three Ghosts of Christmas.
"The Halloween Door" (season 5) — after defeating the demon Boogaloo the Ghostbusters were sent back to right before it appeared.
"It's About Time" (season 5) — after an accident involving a ghost trap the Ghostbusters were sent back to 1959 and had to avoid messing up the time line since the accident that brought them through was allowing ghosts from their to go back as well
"The Naked Time" (season 1) — a strange virus infects the crew of the Enterprise, severely affecting their minds, leading to a crew member deactivating the warp engines. They are emergency restarted and the ship goes back in time by three days.
"Yesteryear" (season 1) – Spock must use the Guardian of Forever to return to his childhood on Vulcan and save his younger self's life, and consequentially, his parent's marriage and his mother's life.
"The Jihad" (season 1) – Kirk and Spock leave the Enterprise for a lengthy mission and find themselves returned upon its completion to the exact moment of their departure.
"Tapestry" (season 6) — Q interferes with Picard's death, allowing him to re-live parts of his life.
"Timescape" (season 6) — pockets of temporal distortions allow the crew to prevent a disaster.
"Parallels" (season 7) — while returning from a Bat'leth tournament, Worf experiences a series of alternate timeline shifts after which he finds himself back in his time line at the exact moment of initial devience
"Firstborn" (season 7) — a mysterious Klingon tries to inspire Alexander to show an interest in Klingon ways.
"Things Past" (season 5) — Sisko, Odo, Dax and Garak find themselves on Terok Nor during the Cardassian occupation of Bajor.
"Children of Time" (season 5) — an accident causes the crew to meet their own descendants - and presents them with an ethical dilemma.
"Wrongs Darker Than Death or Night" (season 6) — when Dukat reveals to Kira her mother did not die when she was three, but was actually his lover, Kira goes into the past using the Bajoran Orb of Time to find the truth.
"Time's Orphan" (season 6) — Little Molly O'Brien disappears in a vortex and later emerges as an almost-feral 18-year-old woman.
A subplot throughout the series involved a Temporal Cold War wherein factions from the 30th century tried to disrupt history. Related to this arc, several episodes involved Captain Archer being sent into the future, and in the two-part episode "Storm Front" (season 4) the Enterprise itself is sent back to the Second World War era.
"Twilight" (season 3) — Archer is infected by subspace parasites, making him unable to lead the Enterprise and prevent the Xindi weapon from destroying Earth.
"E²" (season 3) — a temporal anomaly sends the Enterprise crew back in time more than a century.
"2010" (season 4 episode 16) — SG-1 sends a note through the stargate to the year 2000 in an attempt to prevent Earth from meeting with a malevolent race.
"It's Good to Be King (Stargate SG-1)" (season 8 episode 13) — SG-1 finds that Harry Maybourne has become king on a planet with writings by a time-traveling Ancient that prophecy their current battle with the Goa'uld Ares.