Best sci-fi TV plot holes of all time

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Thunderbirds picture

Path of Destruction - S2-E2

Plot hole: In order to build up suspense, Virgil and Brains stand on the Crab Logger as its dangerous fuel is pumped out, despite the fact that it is hanging on the edge of a precipice. In fact they could have left as soon as they had plumbed in the pipes to empty the fuel tanks - the whole procedure is controlled by Scott in Thunderbird 1 and they make absolutely no contribution to the operation at all. They do not need to disconnect the pipes; they are left behind and dropped from Thunderbird 1 as planned. They just stand there chatting about how much danger they are in until jumping clear at the very last second. Silly buggers.

More Thunderbirds plot holes
Red Dwarf picture

Can of Worms - S11-E6

Plot hole: Near the end of the episode Rimmer, Kryten and Lister are all in a Mexican standoff, each facing two shapeshifters who are impersonating them. The trouble is, thanks to Kryten's previous intervention Lister is now a soulless, unfeeling killing machine. Earlier he shot and killed a shapeshifter who could well have been Cat - he didn't know it was a shapeshifter and by his own admission he didn't care. We have already seen how fast on the draw he is - why didn't he just open fire on the six shapeshifters, Kryten and Rimmer in order to ensure his own survival? Don't tell me he was worried about being shot himself - fear is an emotion, too.

More Red Dwarf plot holes
Fringe picture

And Those We Left Behind - S4-E6

Plot hole: The very ending scene where Peter (in this version died in the ice as a boy so Walter's wife never met him) takes off some of the dust covers then picks up a toy airplane. The toy airplane he got as a child from ... Walter's wife when she was trying to placate him in an earlier episode for trying to run "home". This toy airplane wouldn't have been his as a child in this version of the universe. (00:42:00)

juarlita
More Fringe plot holes
Heroes picture

An Invisible Thread - S3-E25

Plot hole: If Noah could be brought back from the dead with Claire's blood why couldn't they bring back Nathan? Was turning Sylar into Nathan really the first thing they could think of?

More Heroes plot holes
Limitless picture

Pilot - S1-E1

Plot hole: Brian calls Rebecca after he has been shot. She asks him "Where is the bullet? Is it in your leg still?" Brian never mentioned he was shot in the leg. (00:30:20)

More Limitless plot holes
Doctor Who picture

Planet of the Spiders - S11-E5

Plot hole: At the climax of episode 2, the Doctor is about to catch Lupton when the latter simply teleports to safety. So why didn't he do that in the first place, before engaging in a 15-minute chase?

More Doctor Who plot holes
Star Trek: Voyager picture

Elogium - S2-E4

Plot hole: In this episode Kes states that she has to decide now whether to have a child or not because Ocampa women can only get pregnant once and deliver one child. If that was the case they would have died out a long time ago, or never even evolved, as two people only getting one offspring would reduce the population to 50% of the original figure each generation.

Upvote valid corrections to help move entries into the corrections section.

Suggested correction: It's also possible that it's simply required of Ocampan women to give birth the first time they go through it, and can then experience it again.

Greg Dwyer
More Star Trek: Voyager plot holes
Star Trek picture

Show generally

Plot hole: "The Cage": Pike says he doesn't want women on his bridge, Number One being the one and only exception, and he keeps ordering Colt off it. His apology to Number One indicates that A)he doesn't think of her as female, and B)she's the only exception to his rule. So how does he overlook the very female crew-woman seated at the science station? (00:06:55)

Jean G
More Star Trek plot holes
Doctor Who picture

New Earth - S2-E4

Plot hole: Those people created for medical experiments cannot run. In fact they can barely walk, so how come they can climb nearly as fast as Rose? What's more, when you see them climbing, they seem to have little ability to coordinate hand over hand. Even with the delay brought on by the cat-woman-thing, they should not have been able to keep up with her.

More Doctor Who plot holes
The X-Files picture

Darkness Falls - S1-E20

Plot hole: At the end, a man is attacked while standing in the light of his automobile's headlights. Supposedly, though, the bugs were terrified of light. (00:38:45)

More The X-Files plot holes
Star Trek: The Next Generation picture

Angel One - S1-E14

Plot hole: Data calculates the time to reach the Neutral Zone in time by assuming maximum warp speed. After the solution, in the last minutes, Picard orders only warp six. With this speed, they won't get there in time. Aren't they in a hurry anymore ? (00:35:30 - 00:42:20)

More Star Trek: The Next Generation plot holes
Star Trek: Deep Space Nine picture

Facets - S3-E25

Plot hole: How could Jadzia have been unaware that Curzon was infatutated with her if she inherited all his memories after being joined?

More Star Trek: Deep Space Nine plot holes
Mighty Morphin' Power Rangers picture

A Friend in Need (3) - S3-E3

Plot hole: Somehow Bulk and Skull know that the Rangers use the phrase "It's Morphin' time" and also reach behind their belts. They're not supposed to know this, unless they know the Rangers' identities (which of course they don't know despite their "efforts").

More Mighty Morphin' Power Rangers plot holes
Futurama picture

Fry and the Slurm Factory - S2-E4

Plot hole: Fry, Leela, and Bender all went downward several feet when the slurm river goes through the pipe, yet are still level with the fake slurm factory that they were in before.

More Futurama plot holes
Tru Calling picture

Show generally

Plot hole: Throughout the series, auxiliary characters are always far too willing to give all kinds of information to Tru. Doctors and registrars constantly give her privileged information about patients and students. Tru is often able to retrieve information like addresses and phone numbers from people's service and utility companies, when normally you must verify your own information before they will even talk to you about your account. Of course there can't be an episode if Tru doesn't quickly find the person who asked for her help, even though she doesn't usually know much more than their name, but it's still a bit conspicuous.

DavidK93
More Tru Calling plot holes
Smallville picture

Pilot - S1-E1

Plot hole: After Chloe shows Clark the Wall of Weird, Clark is confronted by Whitney outside. Whitney is wearing Lana's meteor rock (kryptonite) necklace but Clark actually feels no effects until he ends up opening Whitney's shirt.

More Smallville plot holes
Ben 10 picture

Be Afraid of the Dark (2) - S3-E12

Plot hole: When the Corrodium Beam is shut down, there is a brief scene of the sky clearing at Mount Rushmore. But on the cliff face all four heads are seen, whereas the head of Theodore Roosevelt got crumbled in "Secrets," and it's too far forward to have been carved into the mountain face, in place (and same position) of the old head, yet again.

More Ben 10 plot holes
Stargate SG-1 picture

Show and Tell - S2-E20

Plot hole: The last two invisible aliens are in the room with Charlie and "Mother". Since both of them can see the aliens, why don't they warn O'Neil that they are there?

More Stargate SG-1 plot holes
Blake's 7 picture

Seek-Locate-Destroy - S1-E6

Plot hole: When the Liberator returns to the planet, Travis remarks that their orbit is too far away to use their matter transmitter. Since Travis had only found out that they even HAD a matter transmitter (which the Federation hasn't managed to develop yet) when he spoke to a technician just before that, how would he know what the range was? (00:43:50)

DaveJB
More Blake's 7 plot holes
Dexter's Laboratory picture

Ant Pants - S2-E3

Plot hole: Didn't Dexter ever notice the giant fire pit in the ant farm?

Piemanmoo
More Dexter's Laboratory plot holes

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