Back on Sonic's home planet, Eggman has collected all 7 of the Chaos Emeralds, and is about to have absolute power when Sonic interferes, causing an explosion that sends everyone from their world to Earth. Sonic and his friends team up with 12 year old Christopher Thorndyke to collect all the Chaos Emeralds and defeat the evil Dr. Eggman. 
(Source: Anime News Network)

When Dr. Eggman (Robotnik in the US version) holds the president and his daughter hostage, Sonic must comply to the evil scientist's demand of going to Eggmanland to stop Black Eggman and deactivate the city's generator before it reaches critical mass. Little does Sonic know that it's a trap to activate Hyper Metal Sonic, a robot counterpart built by Eggman to destroy our hero.
 
(Source: Anime News Network)

Sonic activates Chaos Control in his battle against Dark Oak, most formidable enemy he's faced thus far, to scatter the Chaos Emeralds across the galaxy. Meanwhile, Tails, Amy, and Cream encounter a spaceship that's crash-landed to their planet during a meteor shower. 

Note: The listed airing dates are from the original US broadcast. Due to poor ratings in Japan, the series cancelled airing after the first 52 episodes, and only received its first local airing in 2020.

Manga series focused on Shadow The Hedgehog in order to promote Sonic X Shadow Generations. 
Shadow and Maria live on the Space Colony ARK, but one day they are suddenly attacked by the Earth Defense Forces who are “disposing of dangerous biological experiments”. Shadow and Maria try to protect each other, but Maria is hit by a merciless bullet…? 
(Source: Shogakukan)

A manga booklet given out to Japanese movie attendees for Sonic the Hedgehog 3.

Original manga based on the Sonic the Hedgehog video game franchise.
 
The story follows Sonic and a boy named Yuuta embarking on a great adventure together.

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