History Main / GrandfatherParadox

13th Jan '17 4:10:25 AM Morgenthaler
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* Defied in the 2010 Dynamite run of ''ComicBook/{{Vampirella}}'' when ConquerorFromTheFuture Professor Quatermass visits his great-grandfather to ensure that he'll invent time travel ahead of schedule to further his plans. When his grandfather hesitates, Quatermass shoots him only after asking him if his grandfather is safe at home.

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* Defied in the 2010 Dynamite run of ''ComicBook/{{Vampirella}}'' when ConquerorFromTheFuture Professor Quatermass visits his great-grandfather to ensure that he'll invent time travel ahead of schedule to further his plans. When his grandfather great-grandfather hesitates, Quatermass shoots him only after asking him if his grandfather is safe at home.
13th Jan '17 4:09:31 AM Morgenthaler
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* Defied in the 2010 Dynamite run of ''ComicBook/{{Vampirella}}'' when ConquerorFromTheFuture Professor Quatermass visits his great-grandfather to ensure that he'll invent time travel ahead of schedule to further his plans. When his grandfather hesitates, Quatermass shoots him only after asking him if his grandfather is safe at home.
20th Nov '16 3:04:54 PM billybobfred
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* Referenced in ''Series/{{Continuum}}'', when terrorists [=Liber8=} attempt to eliminate their adversary Kiera Cameron- both displaced to 2012 from 2077- by killing her grandmother before she can give birth; Kiera attempts to counter this by threatening the pregnant mother of [=Liber8=}'s founder. [[spoiler:The paradox is apparently proven irrelevant when the grandmother of [=Liber8=} renegade Matthew Kellog is killed before she has children and nothing happens to him, but Kiera's ally Alec Sadler notes that lack of evidence is not proof that nothing will happen.]]

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* Referenced in ''Series/{{Continuum}}'', when terrorists [=Liber8=} [=Liber8=] attempt to eliminate their adversary Kiera Cameron- both displaced to 2012 from 2077- by killing her grandmother before she can give birth; Kiera attempts to counter this by threatening the pregnant mother of [=Liber8=}'s [=Liber8=]'s founder. [[spoiler:The paradox is apparently proven irrelevant when the grandmother of [=Liber8=} [=Liber8=] renegade Matthew Kellog is killed before she has children and nothing happens to him, but Kiera's ally Alec Sadler notes that lack of evidence is not proof that nothing will happen.]]
29th Oct '16 4:54:52 PM FordPrefect
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* Referenced in ''Series/{{Continuum}}'', when terrorists Liber8 attempt to eliminate their adversary Kiera Cameron- both displaced to 2012 from 2077- by killing her grandmother before she can give birth; Kiera attempts to counter this by threatening the pregnant mother of Liber8's founder. [[spoiler:The paradox is apparently proven irrelevant when the grandmother of Liber8 renegade Matthew Kellog is killed before she has children and nothing happens to him, but Kiera's ally Alec Sadler notes that lack of evidence is not proof that nothing will happen.]]

to:

* Referenced in ''Series/{{Continuum}}'', when terrorists Liber8 [=Liber8=} attempt to eliminate their adversary Kiera Cameron- both displaced to 2012 from 2077- by killing her grandmother before she can give birth; Kiera attempts to counter this by threatening the pregnant mother of Liber8's [=Liber8=}'s founder. [[spoiler:The paradox is apparently proven irrelevant when the grandmother of Liber8 [=Liber8=} renegade Matthew Kellog is killed before she has children and nothing happens to him, but Kiera's ally Alec Sadler notes that lack of evidence is not proof that nothing will happen.]]



* ''TabletopGame/FengShui'' goes with a belt-and-suspenders approach. Actually changing history is hard and requires taking possession of feng shui sites; doing something minor like shooting your own grandfather changes nothing. Johnny Wong will return to the present to discover that his grandmother met someone functionally identical to his old grandfather and the only difference is that his name is now Johnny Fong. If you ''do'' make the effort to make your changes stick, you can shift history so that you never existed... but accessing the Netherworld (the method of time travel) immediately locks in your personal timeline at that point, and you will never be affected by future shifts. So Johnny Wong returns to a present where he doesn't exist and never did, but he still exists because he's locked to a timeline where he existed. (The Netherworld is full of people who had one too many shifts happen to them and retreated from a world they no longer know and which no longer knows them.)

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* ''TabletopGame/FengShui'' goes with a belt-and-suspenders approach. Actually changing history is hard and requires taking possession of feng shui sites; doing something minor like shooting your own grandfather changes nothing. Johnny Wong will return to the present to discover that his grandmother met someone functionally identical to his old grandfather and the only difference is that his name is now Johnny Fong. If you ''do'' make the effort to make your changes stick, you can shift history so that you never existed... but accessing the Netherworld (the method of time travel) immediately locks in your personal timeline at that point, and you will never be affected by future shifts. So Johnny Wong returns to a present where he doesn't exist and never did, but he still exists because he's locked to a timeline where he existed. (The Netherworld is full of people who had one too many shifts happen to them and retreated from a world that they no longer know and which that no longer knows them.)
29th Oct '16 4:52:20 PM FordPrefect
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* Inverted in ''Film/StargateContinuum'', where Cam Mitchell winds up going back in time, and eventually (ten years down the road) keeping his Grandfather alive as a way of [[SetRightWhatOnceWentWrong setting right what Ba'al had messed up]]. Said paradox was directly referenced before, when Mitchel found out that he doesn't exist in the new timeline because Ba'al killed his grandfather.
* The 2002 film version of ''Film/TheTimeMachine2002'' is [[TimeyWimeyBall inconsistent]] in how it deals with this. The first act demonstrates that it is actually impossible to create a paradox; Alexander builds his time machine so he can save his love Emma from dying, but no matter what he does she always ends up dying in one way or another because if she didn't, he wouldn't build the machine and save her. However, the third act throws this out the window when [[spoiler:Alexander travels from 802,701 to even further in the future, discovers that the Morlocks have conquered the Earth, and then goes back to 802,701 to destroy them so that they can't.]] By the first act's logic, it should be impossible for him to do this, since if he's erasing the reason for his own actions, but it works perfectly anyway.

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* Inverted in ''Film/StargateContinuum'', where Cam Mitchell winds up going back in time, and eventually (ten years down the road) keeping his Grandfather alive as a way of [[SetRightWhatOnceWentWrong setting right what Ba'al had messed up]]. Said paradox was directly referenced before, when Mitchel Mitchell found out that he doesn't exist in the new timeline because Ba'al killed his grandfather.
* The 2002 film version of ''Film/TheTimeMachine2002'' is [[TimeyWimeyBall inconsistent]] in how it deals with this. The first act demonstrates that it is actually impossible to create a paradox; Alexander builds his time machine so he can save his love Emma from dying, but no matter what he does does, she always ends up dying in one way or another another, because if she didn't, he wouldn't build the machine and save her. However, the third act throws this out the window when [[spoiler:Alexander travels from 802,701 to even further in the future, discovers that the Morlocks have conquered the Earth, and then goes back to 802,701 to destroy them so that they can't.]] By the first act's logic, it should be impossible for him to do this, since if he's erasing the reason for his own actions, but it works perfectly anyway.
18th Oct '16 8:20:59 AM Morgenthaler
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* ''Wonder Warthog'' employs this with one case of glaring inconsistency. He is hanging out in a bar with Stoneage Warthog and The Hog from the Future (I may have the names wrong), and the latter decides to explore the nature of a paradox by shooting the former with a zapgun. Since Stone-age Warthog was the direct ancestor of the others, they cease to exist, while the city is retroactively turned into a crime-ridden cesspool because WW wasn't around to do anything. The Hogs are then immediately returned (since Future Hog couldn't have killed Stoneage Hog if he didn't exist) and everything is fine... except the city is ''still'' a hellhole, necessitating the heroes to fix it the traditional way.

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* ''Wonder Warthog'' ''WesternAnimation/WonderWarthog'' employs this with one case of glaring inconsistency. He is hanging out in a bar with Stoneage Warthog and The Hog from the Future (I may have the names wrong), and the latter decides to explore the nature of a paradox by shooting the former with a zapgun. Since Stone-age Warthog was the direct ancestor of the others, they cease to exist, while the city is retroactively turned into a crime-ridden cesspool because WW wasn't around to do anything. The Hogs are then immediately returned (since Future Hog couldn't have killed Stoneage Hog if he didn't exist) and everything is fine... except the city is ''still'' a hellhole, necessitating the heroes to fix it the traditional way.
18th Oct '16 8:20:38 AM Morgenthaler
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* Played with in ''Enter Nowhere'', in which a young woman about to rob a convenience store finds herself transported to an isolated cabin where two strangers are similarly stranded, and where a mysterious rifleman is creeping around in the woods. [[spoiler: The rifleman ''is'' her grandfather, who'd died in WWII without ever seeing his baby daughter, and the others are the still-pregnant mother she never knew and the son she won't live to see grow up. Inverted in that the grandfather actually kills ''her'' and causes her son to disappear in the process, leaving it up to her mom-to-be to save her own dad and thus, all four lives. Played straight in that it's implied the three were sent back in time to avert the grandfather's death because the convenience-store clerk has supernatural power and wanted to give them all another chance ... one meaning that, since her Mom survived to stop her from becoming a criminal, the robber wouldn't have confronted the clerk in the first place.]]

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* Played with in ''Enter Nowhere'', ''Film/EnterNowhere'', in which a young woman about to rob a convenience store finds herself transported to an isolated cabin where two strangers are similarly stranded, and where a mysterious rifleman is creeping around in the woods. [[spoiler: The rifleman ''is'' her grandfather, who'd died in WWII without ever seeing his baby daughter, and the others are the still-pregnant mother she never knew and the son she won't live to see grow up. Inverted in that the grandfather actually kills ''her'' and causes her son to disappear in the process, leaving it up to her mom-to-be to save her own dad and thus, all four lives. Played straight in that it's implied the three were sent back in time to avert the grandfather's death because the convenience-store clerk has supernatural power and wanted to give them all another chance ... one meaning that, since her Mom survived to stop her from becoming a criminal, the robber wouldn't have confronted the clerk in the first place.]]
11th Oct '16 4:17:03 PM PF
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[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/grandfather_paradox.jpg]]]]

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[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/grandfather_paradox.jpg]]]]
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11th Oct '16 4:16:28 PM PF
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[[quoteright:350:[[Magazine/{{Astronomy}} http://static.tvtropes.org/pmwiki/pub/images/grandfather_paradox.jpg]]]]

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[[quoteright:350:[[Magazine/{{Astronomy}} http://static.[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/grandfather_paradox.jpg]]]]
11th Oct '16 10:32:32 AM MikeW
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* Subverted on ''Series/{{Timeless}}'' when the pilot episode ends with historian Lucy returning from altering the fate of the ''Hindenburgh'' (it crashed a day later with only two people killed) to find that her sister, Amy, no longer exists. A computer search reveals that Lucy's father, Henry, married the granddaughter of someone who was supposed to die on the ''Hindenburgh'' and never met Lucy's mother, Carol. Lucy is at first confused how she can exist if her parents never met...then realizes it means Henry was ''never'' her father in either timeline.
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http://tvtropes.org/pmwiki/article_history.php?article=Main.GrandfatherParadox