Film: Beast from Haunted Cave (1959)
Height/Weight: About the same as an average human.
Summary: No matter where one goes, crime doesn't pay. One way or another, justice will bite and do it hard. And in the that horrific spider-like cave monster's case, quite literally.
History: No one really knows where this Cave Monster came from. All that was known was that it resided in a cave filled to the brim with valuable gold, occasionally coming out to find prey. The gold is what attracted a gang of ruthless crooks, and that meant only one thing for the beast that lurked within: Snack Time!
Notable Kills: We get the privilege of (sort of) seeing the beast suck the blood from its captured victims. Ouch.
Final Fate: Eventually, the thieves are drawn to the cave once again, and the monster does them in for good this time. However, the one that it deeply traumatized earlier manages to get a clear shot at it, lighting the beast on fire. The surviving innocents can only watch as the screaming monster is engulfed in flame.
Powers/Abilities: Despite being a clear arthropod, the beast can survive extremely cold temperatures and has limbs capable of lacerating foes.
Weakness: Anything conventional, especially fire.
Scariness Factor: 3-While it does have a somewhat intimidating appearance (and the Cave Tarantula scream to boot), the beast is somewhat hamstrung by shoddy movement and flailing of the arms.
Trivia: -There are a few arthropods that can stand extreme cold. Among them, of course, is the Cockroach, particularly the Alpine one.
-There was a third version of this film's story. It got used to make "Creature from the Haunted Sea" a few years later.