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This character exists primarily or exclusively within the Sonic X continuity.
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Template:Character (Sonic X)

Cosmo the Seedrian (コスモ・ザ・シードリアン Kosumo za Shīdorian?) is a main character from Sonic X, created by Sonic Team exclusively for the third season of that TV series. She somewhat resembles Lumina Flowlight and Void from Sonic Shuffle.

Cosmo is a female child of a plant-like alien species whose homeworld was destroyed by the villainous Metarex. She is an ally of Sonic the Hedgehog and his friends, and it is widely accepted that her primary purpose in the series is that of a love interest for Tails, the two characters being of the same age and displaying an overt fondness for one another.

Appearance and origin

Cosmo first appeared in episode 53 of Sonic X. Her former home world was destroyed by the Metarex before she was born, and she was instead raised on a space colony. She lived peacefully there until the Metarex came and began to destroy her new home, including her family (including her mother, Hertia). As Cosmo was escaping, the Metarex planted a tracking device on her. Cosmo also had a device inside her brain which, when activated, allowed the Metarex to hear and see everything that she did.

After the attack, Cosmo escaped into a ship and arrived on Sonic's planet. Tails, Cream, and Amy were the first to find her, and they questioned her arrival. Cosmo told them that she was looking for the "legendary hero that can use the Chaos Emeralds, Sonic the Hedgehog." However, she refused to tell them any more. Later, while in Tails' jet, the X-Tornado, she spotted Sonic and hopped out to greet him. Cosmo pleaded for Sonic to help her.

Sonic agreed to help her and he, Cosmo, Tails, Knuckles, Amy, Cream, Cheese and Chris Thorndyke, who recently arrived on Sonic's world, began traveling through the universe in Tails' new space ship, the Blue Typhoon in search of the Chaos Emeralds which Sonic scattered through the universe during his first battle with Dark Oak.

Later in the series, Shadow boarded their ship and attempted to kill Cosmo, as he believed her to be a spy for the Metarex, but Cosmo's friends managed to keep her safe. Tails especially endeavored to keep her safe, to the point of almost being knocked unconscious. Before Shadow could do Cosmo any harm, a Metarex broke in and interrupted the fighting. Dark Oak called Cosmo "White Seed" and told her that she did a good job. Cosmo then remembered that before she escaped from her space colony, the Metarex were planning to use her as a spy.

Chris and Tails managed to locate an invisible signal and found that it was attached to her brain; if they had gotten rid of it, Cosmo's hearing and sight may have been lost in the process. In the English version Knuckles said that it would have been best to do that, but Tails refused to harm Cosmo. In the Japanese version, however, Knuckles yelled at Tails that there had to be a way to remove it without hurting Cosmo, to which Tails yelled back that he had no idea how to do both, assuming it was possible.

Later, in the English version, Cosmo learned that she could hear the Metarex in her head and fell into deeper despair. While she was in sorrow, Chris told Sonic that he now understood why Cosmo was able to understand the Metarex language.

In Episode 74, Cosmo tried to run away but was stopped by Tails. Their friends then showed up and said they were determined to defeat Dark Oak instead of risking Cosmo's hearing and sight. In Episode 77, Cosmo sacrificed herself by fusing herself with the Dark Oak planet to make it weaker so that Tails, Super Sonic and Super Shadow could destroy it and save the universe. At first, Tails refused to, but Cosmo convinced him that it was the only way to save the galaxy. Tails trusted Cosmo and ended up shooting her (in the Japanese dub, he yelled that he loved her while doing so) with the Sonic Driver (Sonic Power Cannon in the English dub), causing her to be killed in the process. According to the Japanese version, in an attempt to rescue Cosmo from death, Super Sonic and Super Shadow used Chaos Regeneration, but all they managed to produce was a small seed although in the English version, Chaos Regeneration is not used and Cosmo implies that the seed is her child. In episode 78, when Sonic arrived back on board the Blue Typhoon, he handed this seed to Tails, who collapsed with grief as he realized that Sonic was unable to save Cosmo. However, the seed sprouted in the end.


Cosmo is a kind and gentle character, though she often feels guilt because she was unable to save anyone from her home planet ever since the destruction of the Metarex. She also seems to suffer from a low self-esteem issue, often calling herself "unworthy" or blaming herself for the hardships that she and her friends had to endure. Cosmo also dislikes violence, but acknowledges that fighting is sometimes a necessity, although she herself is unable to fight. Cosmo can be somewhat clumsy, but she is also quite resourceful; she also has a penchant of getting into trouble.

Cosmo shares similar qualities with both Maria Robotnik and Tikal the Echidna. Both Maria and Tikal sacrificed themselves to save their friends/beliefs and are pacifists, but know how to fight when necessary.


Cosmo does have a few abilities, being a plant herself, such as having the ability to empathize with plants, trees, or the planet and determine their state of life. Cosmo can jump high and gently float down with the aid of her skirt. She also appears to be able to unlock the power of a Planet Egg, as demonstrated in episode 58, where she caused the planet egg to activate and grow vines that entangled Dr. Eggman's machines, but also her friends and herself due to her lack of control over the vines. When Cosmo is in her super transformation, she is able to turn into a tree and weaken other planets.


Cosmo's weaknesses include being physically weak and acting a little clumsy. She has trouble carrying heavy objects but can use certain objects as defense. She also shows heavy endurance as she is able to recover from powerful attacks quickly as seen in episode 58 where she quickly arrived back to attack a metarex with fruits after being sent flying into the air by a heavy branch shaped like a club. Cosmo also tends to get into trouble easily. She also might have air sickness as when Tails was flying high above Angel Island, she was shown to be very dizzy and when Amy was trying to catch up to Sonic, she sped up her ship but Cosmo wasn't feeling well so Amy held back.



The only confirmed members of Cosmo's family are her mother Hertia (Earthia in the English dub), who is the leader of the Green Planet council, and her older sister, Galaxina, who worries about Cosmo and her mother.

Earthia/Hertia: Her mother, who is the leader of the Green Planet council. She decides to leave the planet when it becomes too dangerous, but is later killed after the Metarex board her refugee ship. In the dub version of Sonic X, she is instead known as Earthia. During Episode 78, she appears to Dark Oak--now returned to his form as Lucas--and speaks with him, telling him that thanks to Cosmo they now have 'another chance' together; however this dialogue appears only in the dubbed version. This has brought about suspicion that they were previously in love. It also brings the possibility that Cosmo's race will regenerate, though this is unlikely.

Galaxina: Her older sister, whom is shown to worry a great deal about Cosmo and their mother, Hertia. She is portrayed as very smart, sophisticated, and down-to-earth, the opposite of the dreamy Cosmo. She appears to perhaps be the eldest--or most authoritative--of the family who are shown in the beginning of Episode 77, while Cosmo is an 'infant'. She seems to look more like Hertia than the others. She also is one of the few to have a daisy on top of her head rather than two rose buds on the sides of her head. In the original Japanese version, she and the others on the ship had no official names in the show. In the original Japanese version, Galaxina has no name; she was referred to as one-sama ("big sister") by other members of her clan.

Seedling: Possibly Cosmo's child, a seed that was given to Tails by Sonic in episode 78, after Cosmo's death. The name of this seed and if it will survive may never be known since the series ended. It could possibly be Cosmo herself, seeing as the seed it grew from is a white one, just as Cosmo had the Metarex codename, "White seed". Several fans venture to believe this to be a means of revival on her part. Alternatively, it could also simply be a part of Cosmo - all that Sonic could obtain. Plus, it could grow into just a regular plant (rather than a sentient one) as it is seen in the finale, and in Sonic Chronicles The Dark Brotherhood growing in a flower pot in Tails' workshop where it is much taller in size, however, there is no reference in this game, so it is unknown if it is her. In the Japanese version, Sonic and Shadow use Chaos Regeneration, which could also lead to the fact that the seed is most likely Cosmo regenerating back to her natural form over a seedling.


Cosmo became good friends with Sonic and friends, but most particularly with Tails. The two of them ended up alone on a mission together at one point. Also, when the team went to an alien planet, Amy bought a potion that when two people fall into a pool of potion (that had been poured into the pond), they would fall in love, but instead of Sonic and Amy, Tails and Cosmo accidentally fell into Amy's trap for Sonic and fell into the pool on the full moon which activated the potion. (In case they forgot, one of the aliens said that it was so powerful, that the two will always be together.)

While some characters are having their fortune told (Planet of Misfortune) Cream inquires about Cosmo's future and the fortune teller states that there is romance in her future, he also says it is strange since 'Plants and animals do not usually get along.' Future events show that this was referencing Tails and Cosmo. The Seedling that Sonic gave Tails is considered to be Cosmo's child, which since it is in Tails' possession, technically states Cosmo is the Seedling's mother and Tails is the Seedling's father, which makes Cosmo and Tails spiritual parents.

Tails later protected Cosmo when Shadow targeted her for assassination. Tails continued trying to stop Shadow even when he was very badly injured by him. In the Japanese version of episode 77, Tails screamed I love you, Cosmo!, just before he fired the Sonic Driver towards her and Dark Oak, and although in the English version he never bluntly used those words, it is strongly implied throughout the episode that Tails simply didn't have the courage, even at the end, to admit that he loved her (this was only in the Japanese version)




For more images, please see Cosmo the Seedrian/Gallery.



  • In the English dub, Shadow believed that Cosmo was a traitor, despite being the very person who called the Sonic & co. to this mission. However, this is most likely the only reason 4Kids could find to cover up Shadow's violent actions in the Japanese version.
  • In Sonic Chronicles, Tails' Workshop contains a pot plant very similar to the one shown at the end of Sonic X.
  • Because it was never actually shown that Cosmo's sisters were dying, it could be possible that they had survived and managed to get aboard the escape pods like Cosmo did, though it is somewhat controversial.
  • As shown in Episode 59 of Sonic X, when Charmy appeared dressed up in what looked like trash, everyone attacked him mistaking him for a Metarex as well as Cosmo. Some highly doubt that Cosmo would attack a Metarex head on like that and just think she was made to do that because of the episode's plot, some think she just attacked him because of Charmy's size, although it was probably just for humor.
  • Though Cosmo has not appeared as a major character in the Sonic X comics, she has gotten two cameos - in the fifth issue, when Chuck Thorndyke talks about possibilities of extraterrestrial life, and in the twenty-first issue, where a toy in her likeness can be seen at the top of the cover.
  • Cosmo is also similar to Lumina Flowlight, and Void.
  • Cosmo bears a strong resemblance to Kirlia from the Pokémon series.
  • Cosmo's family's names are derived from astronomical terms (Cosmos, Galaxy, etc).
  • The Flower Buds on Cosmo's head are roses.

Start a Discussion Discussions about Cosmo

  • Sonic Boom: Tails' Crush

    139 messages
    • SilverSzymonPL wrote: Mystic Monkey wrote: SilverSzymonPL wrote: Mystic Monkey wrote: Emoinuyasha9 wrote: Mystic Monkey wrote: Maybe...
    • Mystic Monkey wrote: SilverSzymonPL wrote: Mystic Monkey wrote: SilverSzymonPL wrote: Mystic Monkey wrote: Emoinuyasha9 wrote: Mystic Mon...
  • Weaknesses in Episodes

    6 messages
    • I just saw your wrong answer reply. What's the real answer?
    • Because Episode 53 just shows her being very dizzy while Tails was flying high above Angel Island.

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