Yip Yips - often referred to simply as "The Martians" - are a group of cowardly interplanetary visitors presumed to be from the planet Mars. They are terrified of things like clocks, telephones, and computers, despite their obvious significantly advanced technology (displayed through their possession of teleporters). Perhaps luckily for them due to their inherent cowardice, they rarely seem to come face-to-face with other sapients.