Take a goblin, a gremlin, and a dog and you have a Gremble. These critters live with people. Some consider them to be pests for they often will eat any food left out and make messes out of containers. Others see the Gremble as a sign of good luck and will take good care of these seldom seen creatures. Grembles have, from egg until death, the ability to go invisible at the blink of an eye. Leave a tray of milk out in the nursery and your children will always be safe.