Marg Dons are over-sized lizards that have horns stick out of their heads backwards. They are dark gray with amber eyes and black oval gemstones embedded in their foreheads. The alpha male is shown to have a red stone.
Although they sound fearsome, they are not very strong. Instead they relay on their overwhelming numbers to achieve victory against strong opponents. They appear to be a very social species as they have a alpha male that sends commands to the rest. The alpha male was shown to be able to spit fire at its target.
- They resemble a dinosaur species, the Herrerasaurus, in terms of size and behavior.