He appeared in the Sonic Adventure 2 adaptation betweenepisodes 33 and 38, although there were a few differences—such as in episode 38, Shadow teleported Chris and Rouge to Space Colony Ark (instead of just Rouge). Christopher Thorndykereminded Shadow of his true promise to Maria, instead of Amy Rose. The epiphany in episode 38 led him to join with Sonic to defeat the FinalHazard. He then helped Sonic prevent the ARK from crashing into Earth by taking off (and temporarily losing) hisinhibtor rings for a massive Chaos Control. From then on, he makes short appearances in flashbacks, but he makes his true return in episode 60. Super Shadow and Super Sonic stopping Space Colony ARKIn Season 3, he had no clear memory of his mysterious past. The loss of his Rings meant that he used up all of his energy quickly until Chris returned the one that was lost at the ARK (and a copy, since only one was recovered) in Episode 63. When he transformed into Super Shadow, he released all his energy and was knocked out. In Episode 68, he seems to have an image of Maria in his mind. In that same episode, Dr. Eggmanvisits the people of a planet the Metarex are warring with, including one orange-haired female teenager by the name of Molly. Shadow and Rouge meet her, and at the end of the French/Japanese version of the episode, Molly was killed by the Metarex. Shadow erects a makeshift grave for her, and Rouge notes that she was similar to Maria. In the English dub, Molly is seen flying off into the sky and instead of making her a grave, Shadow says that he will miss her and he is worried about her being all alone out in space.
In the last episode of Sonic X, it is unclear what would happen to Shadow from stopping time. However, he is seen putting a flower on Molly's grave, which confirms that he's still alive. Also, Rouge suspects that Eggman knows what actually happened to Shadow.
Shadow is extremely arrogant, aggressive, brooding, and very loyal to whoever he is serving and determined to whatever cause he is fighting for and will not fight fairly to anyone. He is anti-social and does not speak or smile much. He will smirk when Sonic or someone messes up something. But, deep down, he does have a heart. He cares for those who cared for him such as Maria, Molly, and Chris Thorndyke and often follows their goals in his own fashion no matter what the cost is. He can be caring to Sonic by showing up and saving Sonic when he needs it the most.
He also shows over-average intelligence, such as when fighting Scarship he realized a head-on attack wouldn't work. He then switched for some advanced tactics and instead decided to shake the ship apart from the inside by striking its body at incredible speed. Because of Shadow's past, he does not trust anyone besides himself, Shadow is easily the most self-sufficient of all the characters. However, his lonesome and arrogant attitude also puts him apart from the other characters.
Shadow can at times be uncaring. For example, when he learned of Cosmo's true mission, he set off to destroy her. Shadow, however, did this to try to protect the universe, proving that whilst he has a good motive, the means used to achieve it are only acceptable to him.
Shadow firmly believes that he is the "Ultimate Life Form" and almost all other life forms are lesser beings and thinks that no body can stand a chance against him.
Shadow only talks when it's absolutely necessary and dislikes being in groups, much preferring solitude. Shadow often thinks teamwork is unnecessary because he can handle everything on his own.
Shadow is often depressed about the loss of Maria, and this is why he keeps to himself, but his love for Maria is obvious as he goes to great lengths to protect the planet and keep her dream of peace and prosperity alive. He has also been seen protecting other characters, for example Chris, Molly, and Rouge, proving that while his attitude may be like a careless person, he does have some compassion.
Shadow can move at speeds rivaling Sonic's own and can perform many of his moves and tricks like the Spin Attack.
His own unique abilities include the ability to use just one Chaos Emerald to induce Chaos Control and to create and throw Chaos Spears. He can also use the Emeralds' power to transform into his super form, Super Shadow.
His destructive power is also severely increased when he takes off his limiters as seen in one episode where he takes them off, subsequently single-handedly destroying an entire Metarex fleet. Though he is drained of power if he takes them off for too long.
His body is also able to take incredible punishment, such as being slammed into solid surfaces and even being struck by powerful laser cannons.
Shadow has also displayed fearsome combat skills, as in episode 73 when he was able to fight his way through Sonic, Knuckles (with his rings off), and Tails (destroyed the X-Cyclone and escaped traps with Chaos Control). He was also shown fighting his way through a large fleet of Metarex soldiers, destroying them all.
He has also shown incredible signs of superhuman strength, this could be seen in episode 76 when he pushes back against Final Nova, who was around the size of a small planet.
In his super form, all of his abilities are increased on an incalculable scale, and at the end of Sonic X, uses Chaos Control to contain and stop the Planet Egg's explosion, which according to Eggman, would destroy the entire Galaxy.
Rouge first established the business transactions for helping Eggman and Shadow find the Chaos Emeralds. The two do not have the same teamwork relationship like they do in the video game series, whereas Shadow is even more distant from the other characters. Shadow doesn't seem to trust Rouge, like when they teamed up with Chris, to search for the Chaos Emeralds, Rouge wanted to take the Chaos Emeralds all to herself by saying, "Hey guys! Why don't we split up to find the control room?", Shadow as he was not trusting her said, "No, the Doctor wants us to stay together!", Rouge realized that Shadow couldn't trust her and ran off, Shadow noticed her running and found out that she was going to be hurt, Shadow went and saved her and told her not to do that again. In one episode, in the Japanese version, he gratefully thanks Rouge for helping him.
Shadow also seems to be easily annoyed by Rouge, like when Shadow was in the ARK, Rouge said, "Hi, miss me?", Shadow was annoyed and left the room with anger, Rouge then said, "I love it when you give me the silent treatment!". He's also annoyed by her fascination to the Chaos Emeralds, as she views them as just pretty gems.
When Eggman released Shadow from his capsule, Shadow respectfully bowed to Eggman and thanked him, and also told him that he will do whatever he will tell him to. Eggman orders Shadow to help him get all of the Chaos Emeralds. Shadow further helps Eggman in Season 3 against the Metarex or Sonic.
Shown to be Shadow's best friend. They were both born and raised on Space Colony ARK, and shared the dream of going to visit the planet Earth, shown best in a flashback Shadow has where he's talking to Maria. He states"What's it like to see the sky above your head? I want........to find out." However, when Project Shadow was shut down, Maria decided that she had to set Shadow free, and released him to Earth. Apparently, the last thing Shadow saw in that space station was Maria being shot and killed by a soldier. Shadow then spent his time after being awakened planning to avenge her by destroying the humans, which is why he showed Eggman the Eclipse Cannon. He often has hallucinations of Maria, such as seeing her reflection standing next to his on any glass surface, or hearing her plead to him when Chris was asking for help.
Chris seems to remind Shadow of his late friend, Maria. He saves Chris, along with Rouge, just before Prison Island explodes. After he takes them to the ARK, Shadow keeps a close eye on Chris. When Chris begs Shadow to help Sonic save the world, Shadow beats Chris back until Chris is finally able to remind Shadow of what Maria truly wanted, for him to protect the people of the Earth and always watch over them. Shadow later saves Chris, along with Cosmo, in season 3 as repayment for Chris returning Shadow's limiters to him (Japanese version only).
Shadow may have not seemed to like Amy in the series, but in one episode in the Sonic X series, in season 3 Shadow had told Chris that he had saved Amy when he tried to stop Chris from taking the Chaos Emeralds with Amy.
- Shadow is usually seen to have a missing quill in his "hairstyle" as compared to the games.
- Shadow uses the third least amount of "Engrish" in the Japanese version. Right behind Vector, who uses the second least amount of Engrish, and Charmy, who only used it once.
- At the end of Season 3 in the English dub, it leaves a cliffhanger of Shadow's whereabouts but it is implied that Eggman is aware of what happened to him.
- At the end of Season 3 in the Japanese dub, Shadow's shadow can be seen placing a rose on Molly's grave. This tells us that Shadow is in fact alive.
- Although Shadow's blood is red in episode 73, it is hinted in the game Shadow the Hedgehog that his blood is actually green due to all members of the Black Arms having green blood. It should be noted, however that the Black Arms had red blood in the Japanese version of the game.
In the last issue of the Sonic X comic series (which takes place before Sonic and friends return to their home world at the end of season 2), after Eggman sees Shadow Prime, he gets confused and quickly returns to his base, checking to see that Shadow is in fact, still in a stasis tube.