The Asteron (テルスター,Terusutā?, lit. "Telstar") is an enemy in the Sonic the Hedgehog series. It is a mass-produced, starfish-type Badnik model 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.
The typical Asteron has a simple, flat starfish-shaped appearance. Its core body is colored light-yellow and in the middle of the body is gray hole with red eye on the hole. All five sharp points have gray spears, that are pointing towards five directions. Asteron's appearance in Sonic the Hedgehog 4 is more detailed, even though it only involves slight changes.
Sonic the Hedgehog 2 (16-bit)
The first appearance of this Badnik was in the 16-bit version of Sonic the Hedgehog 2, where it served as an enemy. This time around, this Badnik is referred to as Asteron (テルスター,Terusutā?, lit. "Telstar"). In this game, the player encounters them in Metropolis Zone.
In gameplay, the Asterons hide on top of walls, where they cannot be harmed. When the players are inside their area however, their eyes start to blink red and yellow rapidly while they slowly float toward the player. After a few seconds of movement, they will self-destruct, leaving their star points, which are like spears, to fly in five different directions simultaneously. Also, upon their destruction, they release no Animal.
In certain parts of Metropolis Zone, there are narrow vertical passages scaled by running up a screw on nuts. Along these shafts are about four to six Asterons. Their threat is increased as their spear attack can cause the player to fall off the nut, thereby often requiring the player to move away to scroll the screw off-screen to reset the nut at the bottom.
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: Episode I
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. In this game, before their self-destruction, these Badniks spin around.
In gameplay, Strange Relief-based obstacles will periodically fire sideways-aligned Asterons into walls. Because of the sideway view of them though, these Asterons appear as first glance as simple spears. Touching these Asterons while they are in flight will damage the playable characters. If these Asterons are allowed to hit the walls however, they can be used as platforms by the player for a few seconds before they fall off.
During the boss battle with the Heavy Shinobi, the Asterons are used as shurikens by the aforementioned Hard Boiled Heavy when he jumps. At first, he throws only one Asteron at a time, but the more damage he takes, the more Asterons he will throw at once, with three being his maximum. When they are thrown into the wall or floor, the player can use the Spin Jump to destroy them. Leave them alone for too long however, and they will start flashing before detonating and releasing damage-inducing spikes in five different directions.
Powers and abilities
Asterons have the ability to levitate in midair. As their main offense, they self-detonate themselves, causing them to release deadly spikes in five different directions.
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 are not set on to walls. Because the original game does not 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.
Asterons appear as enemies in the Sonic the Hedgehog Level Pack in LEGO Dimensions, during the Metropolis Zone segment. Due to their complex design requiring more bricks, they are considerably larger than Sonic in this game.