* CriticalResearchFailure: In "Speed", the earthworm is stated to be "the fastest thing on no legs". That title actually belongs to the black mamba.
* NightmareFuel: The episode "Horrors", epsecially the winner (parasitic worms)- some can penetrate through your skin, and then live inside you!
** In "Odd Couples", the Greenland and Pacific sleeper sharks are sluggish in cold water, so a small bioluminescent bloodsucking copepod attaches itself to the eye and acts like a fishing lure (which also blinds the shark). Yep, having a parasite for an eye!
*** The snapper and the [[http://en.wikipedia.org/wiki/Tongue_biter tongue biter louse]] definitely qualify.
** "Body Snatchers": [[http://en.wikipedia.org/wiki/Toxoplasma Toxoplasma]], hands down. No wonder it won in this category.
** The fate of the female sea louse in "Mothers"; she gets dragged into a cavern by the male, who pretty much ''rapes'' her, gets pregnant with practically a thousand squirming babies who ''eat her alive from the inside out'' and then burst out of her, killing her in the process.
* {{Squick}}:"Gross Outs".
* TearJerker: In "Mothers", the fate of the [[MamaBear mother octopus]]. She starves herself for months keeping her eggs safe and when they hatch she's so exhausted that she can't defend herself when a predatory fish arrives. And she only won number ''two''.