Two monster children dig deep into their imaginations to become the weirdest creatures of all: humans! The brother and sister duo Blarg and Clarg live in a cave in the crater of a live volcano, playing and pretending all day long. To them, their lava-filled bedroom is a plush carpeted floor, their dinner of critters and grubs a tasty meal of spaghetti and meatballs. While what they pretend may be ordinary to humans, it's fantastical and exotic to them!