For as campy and entertaining as the film is, the Memory Eraser scene is surprisingly intense.
Some of the aliens (and their strange clothes) could qualify.
The scene with the Wood Beast is genuinely tense, especially after Barin performs a Mercy Kill on a young man (barely out of his teens) after he's bitten.
We don't actually see the Wood Beast, just a stinger and a small part of its body (a poison bladder, perhaps?), but make no mistake, it's enough. One suspects if you could see the whole thing, it wouldn't need the poison stinger to drive you mad.
The whatever-it-was that tried to drag Flash under the forest floor in Arborea, of which we see only multi-jointed grappling legs and some sort of extensible stomach.
Klytus' death, complete with bulging eyes and tongue shown on the right.
Barin grabs a visor off of a mook, realizing too late that the thing is wired directly into the poor guy's brain via his eye sockets. Cue the mook's agonized death cry and Barin's Squick reaction.
The bore worms. They're never shown on screen; all we get is Aura's panic when Ming orders Klytus to use them on her. But that, combined with the name BORE WORMS suggests something outrageously nasty.
