Krikkiters
Ford, Arthur, Trillian and Slartibartfast meet a group of murderous Krikkiters on the surface of their planet. Away from the influence of Hactar, they are troubled by their Elders wanting to destroy the Universe as they are keen to have sporting links with the rest of the Galaxy. They appear in the novel Life, the Universe and Everything and the Tertiary Phase of the radio series. They're described as being white, but that's nearly all the indication of their appearance in the book series, but the cover of the CD version of the Tertiary Phase features a drawing of the robots, one of them batting a Cricket ball. On the image, they look rather like Marvin from the 2005 movie, only with longer legs, and smaller heads, including sunglasses-like eyes and antennae, like a play on their name.
Read more about this topic: Loonquawl