The Asteron (テルスター,Terusutā?, lit. "Telstar") is an enemy from the Sonic the Hedgehog series, that first appeared in Sonic the Hedgehog 2. They are a hovering starfish-type Badnik models created by Dr. Eggman. Asterons are simply designed and are located usually on walls and are able to self-destruct and fire its five sharp parts in many directions.
Asteron has a simple, flat starfish-shaped appearance. Its core body is colored light-yellow and in the middle of the body is grey hole with red eye on the hole. All five sharp points have grey spears, that are pointing towards five directions. Asteron's appearance in Sonic the Hedgehog 4 is more detailed, even though involving only slight changes.
Powers and abilities
Asterons can found hiding in walls, floors and ceilings, waiting for Sonic to come close to it. When Sonic approaches, Asteron then moves closer to the hedgehog and suddenly self-destructs, firing all five spears in five directions.
Sonic the Hedgehog 2
Asteron makes its debut in Sonic the Hedgehog 2, where it is one of the three deadly Badnik types featured at Metropolis Zone. These Badniks hide at walls, floors and ceilings, where they cannot be harmed. When approached, however, it will move closer to the player, and then fire its star points, which are like spears, in five different directions. Its red eye helps it to detect the player when they are close enough.
In certain parts of Metropolis Zone, there are narrow vertical passages scaled by running up a screws on nuts, there are about four to six Asterons along the way. Their threat is increased as their spear attack can cause the player to fall off the nut, often requiring the player to move away to scroll the screw off-screen to reset the nut at the bottom.
In the 2013 re-release of the game, a couple of Asterons are present at the beginning of the Metropolis Zone segment in Boss Attack Zone.
Sonic the Hedgehog Pocket Adventure
Asteron Badniks make their next appearance in Sonic the Hedgehog Pocket Adventure, where they are featured at Gigantic Angel Zone. As Gigantic Angel has many identical gimmicks and elements from Metropolis Zone, it has also the same Badnik models with similar attack patterns. However Asterons are seen hovering in the air and the player is able to destroy these Badniks before its self-destruction, thus freeing the animal inside of it. Asteron Badniks also are seen flashing red before its exploding.
Sonic the Hedgehog 4
Asteron make a reappearance in Sonic the Hedgehog 4: Episode I, with a slightly different design. They are featured at Mad Gear Zone, which again has the same Badniks. Despite that, these Badniks retain identical patterns from previous appearances, but the player is once again not able to destroy these Badniks. Before its self-destruction, these Badniks spin around.
In the Debug Mode of Sonic the Hedgehog 2, it is possible to destroy Asteron Badniks simply by Spin Jumping on them and freeing animals inside them if these Badniks aren't set on to walls. Because the original game doesn't let the player to have the chance to destroy these Badniks, animals inside them are apparently killed after the Badnik's activation and self-destruction. However, it is likely that the animals inside Asteron Badniks are non-canon.
Asteron and Crawl are the only Badniks in Sonic the Hedgehog 4 that are not featured in the game's website.
Asteron seems to be a better fit for Oil Ocean Zone, as it would fit in with the zone's motif of having sea creature-based enemies.