The A.B.C. Warriors are a team of war robots designed to withstand 'Atomic', 'Bacterial' and 'Chemical' warfare. They were built to take part in the long-running Volgan War, which Pat Mills had described in several previous 2000 AD strips, including Invasion! and Ro-Busters. Each robot has a distinctive personality - often one programmed by its human creators - but each is more or less able to act with free will.
After the end of the war, the robots were brought together to tame Mars, which had become a futuristic wild west. In further adventures set much later in time, the warriors teamed up with Nemesis the Warlock in his fight against the Termight Empire and to prevent a destabilised Black Hole bypass at the Earth's core destroying the world.
The 'ABC' part of their name stands for Atomic, Bacterial, Chemical, forms of warfare deadly to humans which they were designed to withstand.