Sentinel

Sentinels are giant robots which are programmed to destroy super-powered beings. They were created on Earth to rid the world of these beings. Sentinels are controlled by a supreme intelligence named 'Master Mold'. They can shoot energy out of their hands.

Some 20 years after they were created, Master Mold decided to turn the Sentinels against the humans. The Sentinels eradicated most humans and mutants from Earth. Later, an event occured which sent some of the Sentinels flying into space and they lost touch with Master Mold. Before landing on Bara Magna, Kakamu encountered 5 Sentinels and allied with them. Kakamu told them his enemies, and downloaded his knowledge into them. The remaining Sentinels on Earth were destroyed when Blackout used unstable hadrium to destroy Earth.

Because the few Sentinels remaining now know about Blackout, they tracked him down and fired energy at him. Blackout responded by taking them off-line and having them taken to the lab to be studied and reverse-engineered. They were later tossed into the Theta Gate, somehow causing dozens of Sentinels to emerge.

Trivia

 * They are Monarch's worst enemies.