Spider Men attack the Herculoids

In the first segment of the fifth episode of The Herculoids, titled "The Spider Man" the group is attacked by a horde of spider creatures.  They really don't look like men, do they?  There is no reason given for the attack, though.  One can only assume they were looking for food.  They look more like ants, since they only have six limbs, and their rides only have four.  They are from the Lost Caves, and put up a titanic struggle against the Herculoids, but are no match for them.  The team seals up the opening, and the spider things are never seen again.

Zandor does promise to go into the lost caves and clear them out.  Sounds a little harsh, but perhaps they are not indigenous to the planet Amzot.  We will never know.  Amzot is full of mysteries, probably not by design, but it worked well for the show.  The planet had quite the mystique about it.