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Cosmo is a Labrador-breed dog who possesses enhanced intelligence and psionic abilities. In 1966, she was sent into outer space by the Soviet Union as part of their space exploration program. She was found by the Collector, who kept her on display in his museum on Knowhere, where she was given a collar that allowed her to telepathically speak with others. After the museum was destroyed by the Power Stone, Cosmo was freed and continued to reside freely on Knowhere. A decade later, she reunited with the Guardians of the Galaxy after they purchased Knowhere and officially joined their team as they worked to rebuild Knowhere as a community and their headquarters.
In 2026, following an attack by Adam Warlock, the Guardians left Knowhere to save a mortally wounded Rocket Raccoon and left Cosmo and Kraglin Obfonteri in charge until their return. When her fellow Guardians succeeded, Cosmo helped defend Knowhere when it came under attack by the High Evolutionary's Hell Spawn, and using her powers, she managed to stop the ship from colliding into Knowhere. Following the conflict, Star-Lord, Mantis, Nebula, Drax and Gamora resigned from the team, leaving Cosmo to continue serving as a Guardian alongside new members under the leadership of Rocket.
Cosmo was a Labrador[3] bred in the Soviet Union on Earth.[4] In 1966, the Soviets suited Cosmo up in an astronaut outfit. She was then placed in a rocket and sent into outer space as a test for their space program, with no plans to bring Cosmo back to Earth and intending for her to die in space.[1]
While orbiting in space, Cosmo was discovered by Taneleer Tivan, who kept her in his museum on Knowhere, inside of a large glass box for display. Cosmo underwent scientific enhancement programs that granted her newfound capabilities, including telekinesis, higher durability, improved intelligence, and a much longer lifespan. She was also able to telepathically communicate through her collar.[2] In 2014, when the soon-to-be Guardians of the Galaxy were guided through the establishment by Carina, Cosmo and Rocket Raccoon growled and bared their teeth at each other.
When Carina unleashed energy from the Power Stone, it demolished a large portion of the museum and its properties. Cosmo's box was also destroyed, allowing her to leave her former housing space unscathed, but she chose to remain inside the museum.[4]
Shortly afterwards, while Tivan, who also managed to survive, sat in the ruins of his museum in bandages, Cosmo walked up to him to politely lick his face, as Howard the Duck commented that it was gross and asked Tivan why he let her lick him.[5] In 2018, Cosmo survived when Thanosattacked Knowhere to obtain the Reality Stone.[6]
Guardian of the Galaxy[]
Joining The Team[]
By 2025, Cosmo was reunited with the Guardians of the Galaxy after they bought Knowhere from the Collector as their new base of operations. Cosmo was then recruited as a member of the team.[2]
In December 2025, Cosmo was working with Rocket Raccoon to rebuild Knowhere using her telekinetic powers, however, she ended up getting frustrated with Rocket and asked for treats to work. Later that night, Cosmo along with the other inhabitants of Knowhere, helped Mantis and Drax the Destroyer decorate their base with Christmas decorations to cheer up Peter Quill which ended up temporarily failing because Quill found out Kevin Bacon was kidnapped.
After Kevin Bacon agreed to sing to cheer up Peter Quill, Cosmo hunted and killed a Orloni and gave it to Kraglin Obfonteri as a Christmas gift.[2] Later, Cosmo and Rocket tried to decorate Groot as if he was a Christmas tree, but Groot ended up moving, dropping all the decorations in the floor, upsetting Cosmo and Rocket.[7]
Months later, after finishing their rebuilding of Knowhere, the Guardians usually helped Peter Quill, who was constantly drunk. One night, Cosmo showed off her telekinetic powers to the Knowhere civilians, overshadowing Kraglin Obfonteri, who he then called her a bad dog, hurting her feelings. Shortly after that, Adam Warlock attacked Knowhere in order to kidnap Rocket Raccoon for the High Evolutionary. After Rocket is mortally wounded, the Guardians of the Galaxy left Knowhere to save him and left Cosmo and Obfonteri in charge of protecting Knowhere until they would return.[1]
Sometime later, Cosmo played a game with Kraglin and the other Knowhere inhabitants where she was still hurt by Kraglin's "bad dog" remark, commenting that the Soviets never called her that, but Kraglin continuously ignored her and the others' requests to take back his statement. They were then interrupted by Quill who contacted Kraglin and told him to bring Knowhere to the Arête Laboratories in order to help save Nebula, Mantis and Drax who had been captured by High Evolutionary. Kraglin then brought Knowhere to the Arête Laboratories; however, they were promptly attacked by High Evolutionary's Hell Spawn and henchmen, who managed to infiltrate Knowhere. During the attack, Kraglin finally mastered his Yaka Arrow after experiencing a vision of Yondu Udonta, killing most of the intruders in order to defend Knowhere, but the arrow got stuck against a wall when the last one, Behemoth, dodged it. Before Behemoth could kill Kraglin, Cosmo intervened to save him, with Kraglin finally calling her a good dog before she used her telekinetic powers to slam two walls against Behemoth, killing him. An overjoyed Cosmo then happilly licked Kraglin, telling him she knew he always believed she was a good dog.
Meanwhile, Quill went to the Arête Laboratories with Rocket, Groot and the alternate Gamora where they encountered Nebula, Mantis and Drax, who managed to escape their imprisonment, deciding afterwards to rescue the imprisoned children on the ship. After that, once Nebula piloted the Arête Laboratories into Knowhere, Cosmo used her telekinetic powers to keep Knowhere attached to it, allowing the Guardians to rescue the imprisoned children and other animals on the ship. Although Cosmo initially struggled to hold the two together, Mantis used her empathic powers on Cosmo to encourage her to carry on, telling her that she was still so strong. However, while she held on long enough for the Guardians to rescue all the remaining children and animals during which High Evolutionary was imprisoned on Knowhere for his crimes,[8] she eventually succumbed to exhaustion and collapsed. Due to this, Quill was left behind and almost died in space after the Arête Laboratories was destroyed, but got rescued in time by Adam Warlock, who had a change of heart after Groot rescued him from the ship. Following Quill's rescue, Cosmo recovered and happily licked Quill in relief that he was alive and safe.
In the aftermath of the battle, Quill, Mantis and Gamora left the Guardians while Nebula and Drax chose to remain on Knowhere to raise the rescued children, with Quill making Rocket the new leader of the Guardians. Rocket then played a song from his Zune to celebrate their victory and Cosmo happily danced with the remaining Guardians, Kraglin, the other Knowhere inhabitants and the rescued children.[1]
The New Guardians[]
Battle of Krylor[]
Now serving under the leadership of Rocket Raccoon, Cosmo remained as a member of the new Guardians of the Galaxy, also consisting of Groot, Kraglin, Adam Warlock, Blurp and one of the rescued children, Phyla. The new Guardians found themselves on Krylor, defending a settlement from a stampede of creatures. Prior to the battle, the Guardians discussed their favorite artists and bands on Rocket's Zune. Soon enough, they found themselves charging at the incoming stampede to defend the settlement.[1]
Personality[]
"Just concentrate, you stupid mutt. What?" "I refuse to do any more work while you demean me."
Cosmo does not like being disrespected by others and will react strongly to these demeaning acts. When Rocket Raccoon taunted her with her poor aim, Cosmo retaliated by stating that she would refuse to do any work while Rocket demeans her and demands to be treated well. When Kraglin said she was a bad dog, Cosmo felt offended and repeatedly annoyed Kraglin on many occasions so that he could take back his words, and she was visibly happy when Kraglin finally admitted that she was a good girl.
Moreover, Cosmo is a loyal and caring member to the Guardians. Despite being very strained and tired from pulling Knowhere and the High Evolutionary’s laboratory together so as to allow the Guardians and the other test subjects to escape, Cosmo still tried her best until she can no longer hold the strength and almost passed out. When Kraglin was attacked by Behemoth and was defenseless due to the Yaka arrow impaled to the wall and unable to be pulled out, she walked in front of Kraglin to protect him and use her telekinesis powers to kill Behemoth. During the team’s Christmas celebration, she brought a dead creature to Kraglin as present, though the latter was reluctant to receive this as a present. She also accompanied the new incarnation of the Guardians in adventures across the galaxy with Rocket as their new leader.
Powers[]
"Cosmo, what use is telekinesis if you can't even aim?"
Artificially Enhanced Physiology: Cosmo underwent experiments which caused her to gain various powers such as psionics powers and longevity.
Enhanced Durability: Cosmo is highly durable, as she was able to survive an explosion caused by the Power Stone in the Collector's Museum.
Enhanced Intelligence: Cosmo can talk and communicate with other species, as well as perform complex tasks, unlike other members of her species.
Longevity: Cosmo has been alive since the Soviet Union launched her into space, indicating a lifespan much greater than that of the average dog.
Psionics:
Cosmo moving objects with telekinesis
Cosmo is capable of using psionic powers such as telepathy and telekinesis.
Telepathy: Cosmo is able to mentally communicate with others, automatically translating through her collar.
Telekinesis: Cosmo is capable of moving objects through her mind. She used these abilities to assist Rocket Raccoon in repairing buildings on Knowhere. Cosmo used her telekinesis to lift two giant debris to kill Behemoth and she was later able to stop the Arête Laboratories from crashing into Knowhere.
Equipment[]
Other Equipment[]
Soviet Union Space Suit: Cosmo wears a space suit from the days of the Soviet Union to help her survive the harsh environments of space. Her suit originally included a helmet, which appears to have been removed some time before December 2025.
Translator Implant: Cosmo has a translator implant that helps her understand many of the languages spoken in the universe.[9]
Facilities[]
Collector's Museum: Cosmo was kept in a cage in the Collector's Museum after being found by the Collector. After most of the museum exploded, she escaped from her cage but stayed in the remains of the museum.
In the comics, Cosmo was a male dog and test animal of the Soviet Space program. He was launched into Earth's orbit as part of an experiment in the 1960s but drifted off into space. He later arrived on Knowhere and became mutated, gaining telepathic and telekinetic abilities.
Cosmo was created as a Marvel character loosely based on the real life story of Laika, a Soviet dog that was sent into space aboard the Sputnik 2 to test whether it was possible for humans to survive the launch and conditions of outer space. James Gunn opted on making Cosmo a female in the MCU as an homage to Laika.[10]
