The Egg Pawn is a line of Badnik created by Dr. Eggman to serve as his primary robot forces in his efforts to conquer the world.
After Sonic managed to defeat Eggman in their previous encounter, the doctor disappeared. However, his robot forces remained and continued to attack without a leader. Among these robots were the Egg Pawns. In one town, the Egg Pawns arrived as part of a group of robots to cause destruction. One of the civilians who was wielding a Wispon attempted to fend off some Egg Pawns to save a group of civilians, but one of the Egg Pawns easily knocked him down. Sonic the Hedgehog appeared just in time to save the brave young man and easily defeated the small group of Egg Pawns. After Sonic and Tails started overcoming the horde of robots, the robots attempted to escape the town, so while Sonic took care of the remaining Egg Hammer, Tails closed one of the town's gates just in time to prevent the robots from leaving, which caused them to crash into the gate and get destroyed. (StH: #1)
The Egg Pawn was based on the robot of the same name in the Sonic the Hedgehog video game series. It was unnamed in the comic, but is considered tier 2 canon by this site's canon policy, as it does not contradict already established canon from tier 1.