Grub

The grub were a species from the planet Safenesthome, but where then forced off the planet.

Biology
They had voracious appetites, capable of eating nearly everything they wanted to. The spoke in what sounded like an obese American. They could excrete gelatinous fluid from their tails, which they could use to stick people onto walls and ceilings, as they did with the Metatraxi. Their eggs were identical to grain.

History
The Grub were the original inhabitants of the planet Safenesthome, but treated it badly and ended up devouring nearly everything on it, reducing it to a desert planet.

The planet evolved the Metatraxi in order to fight the Grub back, eventually making them leave the planet. They even eat more after this as a way of putting off memories of the traumatic event.

A hatching of Grubs were hidden abroad a shipment of grain being delivered to the planet by the organisation Earth Aid. The shipment was eventually offloaded and the Grub were back on their own planet. Although there was initial hostility from the Metatraxi, the planet had forgave the Grub for their earlier behaviour and ordered the Metatraxi and the Grub to leave in peace together.