Nightmare Fuel / Lost in Space

TV show

• "There Were Giants in The Earth", while the giant pea pods seemed humorous looking at first. The Jump Scare caused from the things attacking the Robinson's after Dr. Smith cut one open was definitely not funny.
• We're not shown anything, but Hapgood's description in "Welcome Stranger" of alien insects mutating and attempting to eat up his ship. Simply because of his failing to perform the standard decontamination procedure certainly sounds terrifying.
  • The Man-Eating Plant that attempts to devour Penny.
• Near the beginning of "My Friend, Mr. Nobody". Penny being lured into a cave by a mysterious voice that echos her words. The echo seems harmless enough at first, even entertaining. However, once the voice starts speaking in a rather disjointed manner. The situation becomes frightening rather quickly.
  • Later, Mr. Smith attempting to trick Penny by pretending to be Mr. Nobody comes across as rather creepy.
  Penny: Mr. Nobody, please answer me!
  Mr. Smith: ...What shall I say, my dear?
  • The Mr. Nobody's rage after Penny got injured thanks to an accidental explosion caused by Mr. Smith. Penny was only unconscious, but he misunderstood and thought she was dead. Which caused him to cause earthquakes, summons storms and basically tear the planet apart to punish the rest of the Robinsons. Fortunately, Penny recovers in time to stop him from harming anyone.
  Mr. Nobody: You hurt Penny! I will destroy you!
• The Anti-Aliens from "Invaders from the Fifth Dimension". Who are not at all uncomfortable with abducting and lobotomizing those they consider "inferior" life-forms.
• In "Oasis", Dr. Smith grows to giant size thanks to some alien fruit he ate. It doesn't take him very long to become mad with power as a result.
• In "Wish Upon a Star", while out on his own during the night. Dr. Smith encounters a rather bizarre manta ray-like creature that can fly. Which appears to have a sinister looking humanoid face on its body, come flying at him.
• Everything about the Duplicate!Judy in "Attack of the Monster Plants".
• In the two-parter episode "The Keeper", the titular "Keeper" is an extremely frightening man. He has a cold and detached attitude about him. All while looking down upon the Robinsons as lower lifeforms. When he contacts his superior, he openly expresses the idea of kidnapping Penny and Will for his interplanetary zoo. It's rather creepy how neither the Keeper nor his superior have any qualms about taking the children whatsoever.
  • The Keepers' first attempt to ensnare Will and Penny. By approaching them when they are alone and offering them a chance to see all the animals in his collection. Even summoning an adorable pony-like animal for them. The whole situation is extremely unsettling.
  • The detached way Will and Penny speak, once under the Keeper's control.
  Keeper: I see you changed your minds about leaving.
  Will: We're sorry sir, we really want to stay with you.
  Penny: For always Mr. Keeper... always.
• While seemingly harmless at first, the seance Dr. Smith and Penny preform in "Ghost in Space" quickly becomes genuinely frightening. First with native plants flyting through the air, then Smith's own Wiji board flying off.
  • The Robot's description of the "spirit", as it's trashing the Robinsons garden.
  Robot: Invisible, indestructible, irresistible!
  Dr. Smith: You can do better than that, you ninny!
  Robot: Negative. Computers inadequate for further information.
• In "War of the Robots", the Robot's fear of the Robotoid. Even going so far as to sneak off in the middle of the night in an attempt to destroy it. Which only acts as foreshadowing to just how dangerous the Robotoid actually is.
• In "The Magic Mirror", the strange and creepy world Penny finds herself in when Debbie shoves her into the mirror.
  • The alien "boy", who first introduces himself to Penny by giggling eerily from the shadows. He also seems to have very little empathy towards others.
• While not shown, the fact that trade fair mentioned in "The Space Trader" has a market for slave trading.
• "The Time Merchant", in which John signs away 5 years of his life in a contract with the titular time merchant.
  • How about the time merchant explaining that the faster a person moves, the more time they use up as a result? Think about that for a second. You could be burning up years of your time simply by being in a hurry to get something done faster.

1998 Movie

• The spiders, who can travel through deep space.
• When the Robot is programmed to kill the Robinson Family and John shoots at him. The Robot dodges the shot, then turns slowly back to face John, as if it's glaring before saying its next line in such a cold tone.
  Robot: That... was... a mistake.
  • Almost comes off as Badass Boast in a way.
• Spider Smith.
• The whole concept of the Bad Future, and how every misstep of the journey led to it: first the Robot destroying their navigation, using the hyperdrive, them exploring the Proteus, them getting stranded on the planet, Dr. Smith succumbing to his spider-bite and then murdering the women. The result is that Will spends decades in the ramshackle remains of the Jupiter II trying to build a time-machine so that he that he can stop it from happening, while all the while Spider-Smith was just planning to use it to return to Earth just so that he could rule it and eat all the inhabitants. All because Will's dad never came back after searching for a replacement power source. And the way it is discovered plays out like the characters have crossed over into a Dark Fic of the franchise's central premise as a whole: just Dr. Smith, Will and the Robot in the ruins after everyone else is dead, and the Doctor is still manipulating Will to do his bidding and it's all been for not.
  • Penny's diary mindlessly repeating her hopeful voice on her own grave is just the icing on the nightmare cake.

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