Space Mice were a species of intelligent Mice which lived on the planet Arus, a world in an alternate universe. During the war between the Humans and the Drule Empire, the Mice hid the keys to the Voltron Lion Force from the forces of Zarkon. (Robotech/Voltron: 3)
Behind the scenes
In promoting the comic, writer Tommy Yune promised that "Mecha, Mullets, and Mice" would be part of the crossover event.