Times where someone attempts to Make Wrong What Once Went Right in Live-Action TV series.
- Big Wolf on Campus had a Russian agent go through a time portal to make his country win the Cold War.
- Played for laughs in the Blackadder Back and Forth special. It ends with 21st Century!Blackadder as the King of England, and he was able to sabotage the roundheads to make himself an absolute monarch...because he manipulated history to put himself on the throne, also giving Baldrick the figurehead position as Prime Minister.
- Doctor Who:
- The Meddling Monk wanted to mess with history just to see what would happen. He planned to wipe out the Viking fleet with atomic bazookas, thereby leaving King Harold and his troops fresh when they fought the Norman invasion in 1066.
- This is the Trickster's whole shtick — change the universe in tiny, little ways, and completely alter history. Notable examples would be making young Sarah Jane Smith die instead of her friend, or making it so Donna never met the Doctor, who then died because she wasn't there to shock him out of his Heroic BSoD.
- The Daleks' entire motivation, right behind universal genocide.
- The Tenth Doctor may have done this when he had Harriet Jones ousted from office over killing the retreating Sycorax, thus averting the golden age of Britain that she was meant to preside over, mentioned by his previous incarnation. The next Prime Minister we see in power is Harold Saxon, aka The Master — although he was a time traveller himself, who got into office through mass brainwashing.
- "Turn Left" sees a giant beetle that feeds on alternate timelines latching onto Donna and changing the past so she never met the Doctor, creating a truly nightmarish alternate timeline that can only be fixed by sending Donna back in time to make things right again.
- "The Name of the Doctor": The Great Intelligence attempts this as a form of revenge, using the Doctor's grave to simultaneously ruin every effort the Doctor had made to save people. Entire star systems vanish before Clara is able to put things right.
- "Rosa": The antagonist, a racist from the future named Krasko, is trying to derail the Civil Rights Movement by preventing Rosa Parks from either making her famous bus ride, or having to make a stand by refusing to give up her seat. The Doctor and her companions have to work hard to stop him, culminating in the Doctor, Graham and Yaz having to stay on the bus to make sure there are enough "white" passengers (Yaz is of Pakistani ancestry) that the bus driver will insist that black passengers move.
- In Eureka, in the season one finale, it's revealed that the reason why history was starting to unravel in 2010 was because Henry used Mental Time Travel to go back to 2006 and save Kim from an accident. Carter is forced to go back and stop him, causing her death and erasing the last four years of his life, including his marriage to Allison.
- Done in the Farscape episode "...Different Destinations" inadvertently. At first, Crichton and the crew believe that their actions are meant to reset the timeline to its original form, but their actions lead to a massacre rather than a truce in one battle.
- Hercules: The Legendary Journeys has an interesting variation in the two-part episode "Armageddon Now" when villain Callisto is sent back in time by Hope to kill Hercules' mother to prevent his being born. While this is clearly an example of Make Wrong What Once Went Right, Callisto agrees to commit the heinous act in exchange for the chance to prevent her parents from being killed by Xena's army.
- Kamen Rider:
- Kamen Rider Den-O: The Monster of the Week Imagins have this as their goal; they are from a future that doesn't exist anymore, and want to restore it by altering the past.
- Kamen Rider Drive: Two of the show's movies deal with different villainous groups using time travel for this purpose. In Super Hero Taisen Grand Prix, Shocker rewrites the ending of the original Kamen Rider so that their Original Generation villain swoops in at the last moment and defeats the Riders, creating a new timeline where Shocker rules the world. In Surprise Future, the Paradox Roidmude comes back in time to try and make contact with his past self, allowing them to fuse into a being capable of bringing time to a halt.
- Kamen Rider Zi-O: The future that all of the time travelers come from is already a Bad Future where the titular hero has become a tyrant ruling over the world with an iron fist, but the Time Jackers want to make it go even more wrong by replacing Zi-O with a puppet of their own choosing. To do this, they steal the history of the past Kamen Riders and give their positions to unworthy replacements, who become the monstrous Another Riders. Or so they've been told; their leader is just using the Another Riders to push Zi-O along the path to becoming his future self.
- Krypton: The premise is that Brainiac travels 200 years into the past to try to destroy Planet Krypton much earlier than normal, so that Superman and his ilk would never have existed. Adam Strange must travel back and convince the skeptical Kryptonians, including Superman's ancestor Seg-El, of the impending attack. Except it turns out Adam was mistaken. Brainiac did not time travel, this is the contemporary Brainiac doing an attack that was meant to happen, and Adam's interference was part of it in a Stable Time Loop. What Adam is supposed to do is ensure the people survive so Superman can be born.
- Legends of Tomorrow revolved around the cast stopping villains who wished to do this, one of the funniest examples being Gorilla Grodd of all people going back in time to try to kill Barack Obama.
- In a Married... with Children Christmas Episode, Al's guardian angel comes to Al and shows his family's life would have turned out if he had never been born (with Peg having the same kids even if she married a different man, screw genetics!), parodying the movie It's a Wonderful Life. Peg and the kids turn out to be happier, richer, smarter, and probably kinder. Al however, being upset by the sheer happiness in which his family would live without him, demanded to return out of sheer spite. And they all lived again in their hell, tormenting each other ever after.
- In Quantum Leap there was a story arc with an "Evil Leaper" whose job was to set wrong what once went right. Eventually the first evil Leaper gets redeemed by Sam, leading to a second evil Leaper sent to retrieve her.
- Also, in one episode, The Devil himself manifests and admits this trope to Sam (though it ended up being just a dream).
- The Star Trek: Deep Space Nine episode "Trials and Tribble-ations" has disgraced Klingon spy Darvin travel back to the time of Kirk, when Darvin's attempt to sabotage a colony's grain shipment resulted in failure and unmasking. Because of the tribbles. Sisko and his crew have to go back disguised as Enterprise crewmen to prevent Kirk from being killed by the bomb that Darvin put in a tribble.
- Star Trek: Enterprise is full of this, what with their Temporal Cold War and all. The entire third season is riddled with malicious time travel. Subverted, though, in the Season Four opener, "Storm Front". At first, it looks like Nazi aliens came back in time and helped Nazi Germany defeat Britain and invade the US. It turns out that these aliens had nothing to do with it — the altered timeline was the result of some other time traveler killing Lenin in 1916, preventing the rise of the Soviet Union. The current crop of aliens, while having their own Nazi-esque ideology, are just using our Nazis as pawns to help them build their own time machine so they can take over history. The Nazis do get some Stukas with plasma cannons out of the deal, but they get into a dogfight with the Enterprise.
- Supernatural: Season Six gives us an episode that takes place in an alternate timeline where the Titanic never sank. Sam and Dean are still themselves but they drive a Mustang, Bobby is married to a still-alive Ellen and Cuba isn't communist. It's in fact, a better timeline than the Crapsack World the Winchesters live in normally, but it has also set the natural order out of whack and enraged The Fates. So, the angel who did it returns the timeline to normal.
- Timecop: In this short-lived television spin-off, recurring bad guy Ian Pascoe is an evil time traveler who has committed many crimes throughout history, from supplying Al Capone, taking part in assassinations, killing Jack the Ripper to take his place, and causing the Chernobyl and Hindenburg disasters. It's such an extreme case of this trope that the time agents note that they can't even correct all of Pascoe's previous meddling with the timestream, because they're already living inside one that was fundamentally shaped by his actions.
- The premise of Timeless is that terrorist Garcia Flynn steals an experimental time machine in order to go back and alter key moments in American history. Flynn sees it as Set Right What Once Went Wrong, as he's trying to break an evil organization called Rittenhouse's control over America, by any means necessary. The Time Team themselves are sometimes also forced to commit seemingly immoral acts in order to undo the changes Flynn made and keep history as close to the original timeline as possible. In season 2, the heroes team up with Flynn to defeat Rittenhouse, who are themselves using time travel to change history in such a way as to create a perfect Police State that they can control.
- In Tru Calling, Jack Harper, Tru Davies' Evil Counterpart, has this ability. Tru goes back in time 24 hours to save someone who died in the "original" reality, while Jack tries to make sure reality doesn't change. Which one is "good" and which is "evil" can be argued.
- Unbeknownst to Tru, this ability also belonged to her father, who murdered her mother to prevent her from saving people.
- Warehouse 13: After making himself immortal, Paracelsus uses a combination of Artifacts to travel back in time to assassinate the Regents of Warehouse 9 who originally bronzed him, seizing control of the Warehouse and dedicating it to his scientific views, a position he holds to the present day. And, it's implied, he's using all this power to run the rest of the world too.
- On an episode of The Wild Wild West, Ricardo Montalbán plays a Confederate colonel who lost his legs at the Battle of Vicksburg and plans to use his new Time Travel powers to go back and assassinate General Grant, thus changing the course of the battle and, he hopes, the war.
