They appear in Year of the dragon (the first FPS game) where they are seen running around the background. Once the player reaches them they come in a pose and attack. They have a protective shield, what the player has to do is defeat the attacking rabbids. Then their shield vanishes and the player can hit them. (Each space rabbid needs one hit to defeat). The purple space rabbid (who is probobly the leader) is also a unlocklable costume.