Kleggs are most famous in Mega City One for their use by Chief Judge Cal in suppressing the rebellious population through sheer terror. However, Kleggs are known throughout the galaxy for being particularly vicious mercenaries. Willing to fight for anyone, they demand nothing more than fresh meat from their employers who will usually supply this from the enemies the Kleggs are crushing. It is an easy arrangement that suits both parties.
These mercenary bands roam the galaxy, looking for anyone disreputable enough to hire them. When business grows thin, they will quite happily invade a town, city or world on their own time, terrorising the local population before eating them. This is when the mercenaries become an invasion force. The Kleggs rarely stay long on any world as they pay keen attention to mounting resistance, usually departing when their prey receives reinforcements and the fighting gets serious. Kleggs enjoy a good fight as much as the next alien, but they much prefer to hunt down helpless prey than trade shots with heavily-armed and well-trained soldiers.
Most Kleggs are not blessed with an over-abundance of intelligence, but among them are the ruling high caste, Kleggs bred for their ability to think their way round problems, and fine-tuned with an education centred around military conquests. The presence of one of these can make a Klegg invasion force much more terrifying.
All of the figures I'm showing here were produced by Warlord Games for the Judge Dredd Miniatures Game and the stats for a Klegg invasion force can be found in the Blood on the Streets supplement (see page 114).