List of Marvel Comics Characters: E - Earth Sentry

Earth Sentry (John Foster) is a fictional character who appeared in the Marvel Comics' MC2 series A-Next. He was created by Tom DeFalco and Ron Frenz, and first appeared in A-Next #2 (1999).

When John and his father Bill were investigating a UFO crash site, they discovered a Kree space probe. Upon nearing the ship, the automated defenses activated, and a robotic sentry was released. Bill activated a distress signal which was picked up by Mainframe and the rest of A-Next.

When the heroes arrived, the sentry robot attacked them. Thunderstrike's sonic blasts and J2's superstrength were not slowing the attacker. Stinger was able to blind the robot's optic sensors with sting darts, providing an opening for John to enter the ship and try to turn off the robotic sentry. When John made contact with the ship's console, a strange energy surge ripped through the ship's computers and struck John. The energy wave reconfigured John's DNA, making him genetically similar to a Kree warrior.

Finding himself clad in a green-and-white costume, similar to the original costume of Mar-Vell, John discovered that he had acquired great powers. John confronted and defeated the sentry robot, and stated that he would become an "Earth Sentry" to protect his planet from invaders.

He politely declined membership with A-Next, but when the team was later captured by The Revengers, Earth Sentry returned and used his powers to help A-Next defeat the invaders. He then accepted membership with A-Next.

Earth Sentry possesses superhuman strength and durability, due to his altered human/Kree DNA. His costume has wrist-mounted blasters that can fire photonic energy blasts. Rocket boosters on his belt allow him to fly.