The alien species known as the Kree developed and built the Sentries to watch over their military advanced bases and supply depots throughout all the Kree Empire and beyond.[citation needed]

Some 80.000 years ago, in Kree year 1220, Kree scientist Bronnek developed the prototype Sentry and the Supreme Council of the Kree Empire began to mass-build Sentries for military purposes. Hundreds of thousands of Sentries were built, although only a few thousands are currently active.[citation needed]

Sentry 213 was the first Sentry sent to the Earth's system, and it was placed in a little surveillance/supply deport on the surface of Uranus. It was discovered by an exiled group of Eternals, who proceeded to destroy the Sentry and invade the depot.[citation needed]

The Kree believed that the system lacked of intelligent life, so they sent an armada to investigate. They found the Eternals building a ship to go back to Earth. They fought and the Kree damaged the Eternal ship. The survivors had to refuge on Titan, a moon of Saturn, where they developed a technological civilization.[citation needed]


  • Auto-repair: A Sentry can repair itself unless it is destroyed.
  • Communications: A Sentry can transmit and receive data from the Kree at lightspeed. As the Kree lived in another galaxy, most of the communications are not urgent.
  • Robot: Due to its nature, the sentry is protected by the sheer strength of its hull. It cannot be affected by emotional or mental attacks, nor by illusions. However, he is susceptible to attacks affecting machinery.

Strength level

80 ton range.

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