Stingrays
Stingrays were creatures that devoured everything on a planet. They traveled from planet to planet using wormholes. UNIT named them “alien stingrays” but their actual name is unknown.
Biology
The stingrays had a wide head with little eyes and gills, a long tail, and fins down their sides. They were about the size of a small car but were capable of flight at speeds of at least 300 miles per hour. They were omnivores, capable of eating meat, plants, rocks, or metal. Any metal they ate would be transfered into their exoskeleton, making them bullet proof but not immune to explosives.
Their exoskeletons allowed them to produce large amounts of static energy which they used to create their travel wormholes. Once they fed on everything on a planet, they would circle the body and their high speeds would rip open the fabric of time and create a wormhole to travel with. The metal allowed them to survive the trip.
Appearances
Planet of the Dead (TV)