Injector

Injectors are a race of nasty and terrifying fauna that inhabit Cybertron's underworld.

Biology
Injectors red, black, and yellow robotic hornets with green eyes and lionfish-like heads that can have secondary faces appear out of the mouths.

Powers and abilities
Injectors and fly and possess stingers that can inflict pain on Cybertronians.

Weaknesses
Injectors can be driven back by fire.

History
After the Great War and Quintesson invasion ended, Grimlock traveled through Cybertron's underworld in search of Bumblebee when he found the Monsterbot Repugnus fleeing from a swarm of Injectors. During the chase, the lost Grimlock joined the flight until they reached the rest of Repugnus's tribe. While the Monsterbots safely hid in their burrows, Grimlock was left behind due to his larger size. An Injector stuck him by the rear only to be swatted away by his tail. The other Injectors were scared off by Grimlock's fire breath.