Their species are brownish-green in color, and have solid-colored eyes, similar to an Irken's. They are very tall, and their shoulders go up to their heads. Mary and Fred travel around in a huge cloaking device-equipped spaceship, abducting both sentient and non-sentient creatures and performing "experiments" on them. However, all of their specimens have easily escaped, save one, who has been "fused" (duct taped) to various items by Mary and Fred and lacks the limbs necessary to leave his containment tube.