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Floating mine that launches five spiny projectiles

— Description, Sonic the Hedgehog Encyclo-speed-ia

The Asteron[1] (テルスター[2] Terusutā?, lit. "Telstar") is an enemy that appears in the Sonic the Hedgehog series. It is a mass-produced, starfish-based 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 its body is a gray hole with a red eye in the hole. All five points on the Asterons also have gray spears on their tips. Asteron's appearance in Sonic the Hedgehog 4 is more detailed, even though it only involves slight changes.

Game appearances

Sonic the Hedgehog 2 (16-bit)


The first appearance of this Badnik was in Sonic the Hedgehog 2 (16-bit), where it served as an enemy. This time around, this Badnik is referred to as Asteron[1] (テルスター[2] 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.

In the 2013 remaster 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 Pocket Adventure.png

The Asterons 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

Asterons 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.

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 other media

Books and comics

Sonic the Comic

An Asteron, from Sonic the Comic.

In the Sonic the Comic comic series and its spin-offs published by Fleetway Editions, the Asterons were some of the Badniks in Dr. Robotnik's army. Some of them were unleashed on the civilians in Metropolis Zone just to remind its residents of who ruled the city. However, thanks to the Freedom Fighters, the Asterons were destroyed.

Archie Comics

A group of Asterons, from Sonic the Hedgehog #229.

In the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics, several Asterons guarded the Metropolis Zone during Operation: Clean Sweep, which Sonic faced on his way to the core of Dr. Eggman's base.

After the Super Genesis Wave rebooted the timeline, Asterons became virtually identical to their game counterparts. These Asterons were stationed in the Metropolis Zone as the Badniks used by the Metropolis Egg Army.


  • 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.
  • The Asteron and Crawl are the only Badniks in Sonic the Hedgehog 4 that are not featured on 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.







  1. 1.0 1.1 Sonic the Hedgehog 2 (Sega Genesis) United States instruction booklet, pg. 15.
  2. 2.0 2.1 Sonic the Hedgehog 2 (Sega Mega Drive) Japanese instruction booklet, pg. 51.
Navigation templates to Asteron

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