The Punisher Robots are the armed forces of the world devourer Galactus. The Punisher Robots reside on Galactus' Ship and answer directly to Galactus' mental whims, attacking any enemy Galactus cannot be bothered with. It is uncertain how many Punishers Galactus has, sometimes only calling one and other times calling a multitude. It would also seem that they are obedient to any current Herald of Galactus as well.
The Punishers have incredible strength and speed, capable of inflicting a barrage of physical attacks at super speeds. Even with near invulnerability, the Punishers have displayed the ability to create force fields.