Slippery cyber-silverfish.

The ‘pets’ of the Cybermen, these nippy little armoured silverfish were first introduced in The Tomb of The Cybermen. Although anyone with a reasonably sturdy pair of boots could probably squish one with ease, they have been known to terrify grown men with their scary scuttling.

Cybermats are used by the Cybermen as advance guard, slipping in and snooping about where their masters would be too easily spotted. They have been known to pounce on their victims, injecting poisons into a person’s neck.