Two monster children dig deep into their imaginations to become the weirdest creatures of all: humans! The brother and sister duo Clarg and Blarg 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 an tasty meal of spaghetti and meatballs. While what they pretend may be ordinary to humans, it's fantastical and exotic to them.