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• Jack Fisher as Kid Mulligan,^[3] a nine-year-old kid who finds the first five Stones of Power and uses them to fulfill his dream of being a superhero. His real name is Kid Mulligan. He is an orphaned kid living with his grandfather, George "Papa G" Mulligan, in a junkyard where he spends time reading comics and collecting curious stuff from the yard. He is motivated to be a superhero after his parents died in a car collision and feels that having powers would have allowed him to save them. In the first season, he tried to dominate the use of the green Stone of Power which he initially thought was for flying until it is later revealed to have telekinetic powers. After losing this stone to Fantos in the second season, he uses the olive green Stone that transforms him into a slime form to the disgust of him and the rest of the gang. In the third season, he mastered the use of the Green Stone to the point of slowing down Erodius and prevents it from hitting Earth.
• Amanda C. Miller as Johanna "Jo",^[3] a teenage waitress at Mo's Oasis and Kid's best friend who dreams of seeing the world, and is granted the power of portal creation by the purple Stone of Power. Her hero name is Portal Girl and she is also the leader of the team. In the second season, she has to prove her leadership abilities by leading the Local Heroes to find the remaining stones and confronting Erodius. In season 3, she found out her power stone doesn't just create portals to places she can think of, but also to places she can imagine.
• Lily Rose Silver as Rosa Flores,^[3] a Mexican-American four-year-old girl who is granted the power to enlarge herself to gigantic proportions by the blue Stone of Power. Her hero name is La Niña Gigantica, which is Spanish for "The Gigantic Girl". She is the daughter of Ramona and Carlos Flores and an energetic girl that is devoted to helping Kid and Jo in their adventures despite her young age, going to the point of recovering the Power Stones by herself. As a regular girl, she loves dinosaurs and princesses.
• Tom Kenny as Stuck Chuck,^[3] an alien who is among the first to try to steal the Stones of Power from Kid and ends up stuck with Kid's group when, as a result, he loses both his ship and legs. His name is a nickname thought up by Jo since his real name was never revealed, and he was also the one who caused the spaceship with the first five Stones of Power to crash on Earth. Initially seeking any opportunity to get the stones for his Great Leader, he reforms near the end of the first season by also providing his translator to Tuna Sandwich because he began to understand English. In season two, he works as a dishwasher in Mo's Oasis and gains the dark blue Stone of Power, granting him pain absorption. Similar to Kid, he also likes to read comics.
• Fred Tatasciore as Tuna Sandwich,^[3] a cat who resides at Mo's Oasis and to whom Kid gives the red Stone of Power, granting him the power to see glimpses of the future. His hero name is The Precognitive Cat. Tuna wears a high-tech collar that translates his speech into English, given to him by Chuck as of "The Invaders from Earth".
• Keith Ferguson as:
  • George "Papa G",^[3] Kid's hippie grandfather who encourages Kid to find nonviolent solutions to his problems, and is granted the power to clone himself by the yellow Stone of Power. His hero name is Old Man Many Men. His design and personality are very similar to Wander from McCracken's third animated series, Wander Over Yonder. In the third and final season, he is revealed to be 112 years old, as he kept the silver Stone of Power, which grants the wielder instantaneous healing abilities since he found it as a child and it has kept him healthy ever since. But once he returned the silver stone to Erodius, his vitality disappeared and he became weak and decrepit to the point where he now needs a wheelchair to move around, as his age finally caught up with him.
  • Carl, a trucker and regular at Mo's Oasis. In the second season, he gains the ability to turn invisible through the turquoise Stone of Power.
• Kim Yarbrough as Florence "Flo",^[7] Jo's mother and proprietor of Mo's Oasis. She tries to keep her business floating even when dealing with Kid Cosmic's antics, including having her diner in space. Despite that, she decides to support Jo, even if she prefers to get mentorship from Queen Xhan. She tends to use several of the Power Stones Jo finds in the second season while she never dominates the use of one. However, in the third and final season, she dominates the use of the olive green Stone, even to the point to stop Fantos a little.

Supporting

• Christian Lanz as:
  • Carlos Flores,^[7] Rosa's father and a regular at Mo's Oasis and Ramona's husband. He and his wife run a successful floral business. In the second season, he gains the white Cosmic Stone of Power, which grants the user the ability to breathe ice.
  • Carlax, an intergalactic postal worker who had been delivering the first five Stones to Fantos until he was shot down by Chuck. He later becomes a regular at Mo's after being reunited with his family and is the first customer to arrive when the Oasis reopens on Earth.
• Grey Griffin as:
  • Carla, a biker and regular at Mo's Oasis. She becomes part of the Local Heroes by getting the pink Cosmic Stone of Power that allows her to run at super speed.
  • Ramona Flores, Rosa's mother and a regular at Mo's Oasis, and the wife of Carlos. In the second season, she gains the orange Cosmic Stone of Power, which grants the user the ability to breathe fire.^[7]
  • Cadet Vinia
  • Boss Fiosa, an evil two-headed alien crime boss who possessed the orange and white Stones of Power before the Local Heroes pulled off a heist to take them from her.
• Jason Hightower as Biker in Black,^[7] the leader of Earth Force Enforcement Force who believes all aliens who come to Earth are hostile. After his defeat in the first season, he plots revenge by building a giant robot to take down the Local Heroes but was soon defeated afterwards (though this was later revealed to have occurred in the Fantasy Realm).
  • Earth Force Enforcement Force consists of Lanz as Crimson Vision, Griffin as Violet Vanish, Eric Bauza as Emerald Wing, Phil LaMarr as Golden Swarm, and Michaela Dietz as Blue Behemoth.^[7] Their colors correspond to the powers granted by the Stones of Power. They follow the Biker in Black's orders to dispose of all aliens on Earth, but when their suits are destroyed at the end of the first season, they reform themselves.
• Cree Summer as Queen Xhan,^[7] a purple jellyfish-like alien who is the former bearer of the purple Stone of Power. She ends up being the only survivor of her group of friends at the end because of Erodius the Planet Killer. She acts as Jo's mentor in terms of leadership in the second season, and during it, she loses one of her tentacles when Fantos tears it off to use as a weapon and is forced to escape with the other aliens from Mo's Oasis Cafe when the cafe itself is being destroyed by Erodius. It was revealed that she was not able to pull her comrades out of Erodius' gravity on time, having to run away to Earth by creating a portal. She later returns in season three, finding the Global Heroes in the vacuum of space and providing refuge to them, later she appears as a customer at the newly rebuilt Mo's Oasis Cafe.
• Fred Tatasciore as:
  • Great Leader, the evil, cowardly ruler of Stuck Chuck's people.
  • Gortho the Gargarian, a yellow goblin-like creature who was the former bearer of the yellow Stone of Power. He died from being pulled by Erodius' gravity in a fateful battle where only Queen Xhan survives, and in the series finale, Kid and his friends have a funeral for him.
  • Meep, a small light blue insect-like alien who was the former bearer of the blue Stone of Power. He died from being pulled by Erodius' gravity in a fateful battle where only Queen Xhan survives, and in the series finale, Kid and his friends have a funeral for him.
  • Hamburg, a guy who works at Mo's Oasis Cafe and is usually seen with Fry. In the second season, he obtains the indigo Cosmic Stone of Power, giving him multiple arms.
  • General Staunch, the General of a tiny civilization. He ordered his cadets to retreat when they learn the Global Heroes lost the Cosmic Stones, but he personally gives medals to the three cadets that helped Rosa to retrieve the Cosmic Stones back from Fantos.
• Eric Bauza as:
  • Master Wilkson, a green humanoid alien with an enormous head and swirly eyes who was the former bearer of the green Stone of Power. He died from being pulled by Erodius' gravity in a fateful battle where only Queen Xhan survives, and in the series finale, Kid and his friends have a funeral for him.
  • Fry, a man who works at Mo's Oasis Cafe and is usually seen together with Hamburg. In the second season, he obtains the light pink Cosmic Stone of Power, which gives the user the ability to stretch their body.
• Sam Riegel as PT-SB, a black and red robot who was the former bearer of the red Stone of Power. He died from being pulled by Erodius' gravity in a fateful battle where only Queen Xhan survives, and in the series finale, Kid and his friends have a funeral for him.
• Bobby Moynihan as Fantos the Amassor, an evil, immature fanboy of Erodius the Planet Killer, who is obsessed with obtaining all 13 Cosmic Stones of Power in order to help Erodius destroy the universe. He also lives with his mother and goes to her for emotional support. In the third season, he is absorbed into Erodius when its surface opened up and he sank into the goo-like quicksand.
• Clancy Brown as Erodius the Planet Killer, a mysterious, sentient rogue planet that generates a powerful gravity well to destroy other planets and absorb them into its body as it travels in a single direction throughout the cosmos. It is possibly a reference to both Ego the Living Planet and Mogo. At the end of the second season, it seems to be defeated when the Local Heroes use the Goo and Growth Stones to cause it to explode from the inside. At the end of the third and final season, it's revealed it didn't explode and it was a living planet that was seeking the power of the fourteenth stone to restore itself to its original state, and shows the Local Heroes how it once used its power to heal injured and sick aliens until it got smashed into pieces by an asteroid and its consciousness survived and it only destroyed planets because it was searching for its last remaining fragment. It was permanently put to rest when Papa G sacrificed his Stone to it and it disappears afterwards returning home.
• April Winchell as Krosh, an alien warrior who was the previous champion of the Fight Hole. She allies temporally with Jo to beat Erodius but was killed by Fantos after trying to steal the Power Stones, when he vaporizes her and her duplicates into nothing but ash.
• Toks Olagundoye as Madame President, the leader of a tiny civilization whose planet was destroyed by Erodius, and uses a room of Mo's Oasis Cafe to rebuild their civilization. At the end of the second season, they run away with Queen Xhan teleporting them to safety when Mo's Oasis Cafe is destroyed by Erodius.
• Nicolas Cantu as Ensign Mainstay, the second on board of the tiny civilization is cautious about the intentions of Flo until he realizes the big effort the Local Heroes did to save them.
• Phil LaMarr as Bombardier Brake
• Cathy Cavadini, Tara Strong and E. G. Daily as (respectively) Agent Pink, Agent Blue, and Agent Green of the PPG (Planet Protection Group), a new government agency who first appears at the end of the second season after the destruction of Erodius the Planet Killer. Their codenames, hairstyles, and actresses all refer to the eponymous characters of McCracken's first animated series, The Powerpuff Girls. But in the third and final season, they were revealed to be illusions created by the Global Heroes due to them being trapped in a fantasy world Fantos made to keep them out of his way.

Minor

• Lauren Tom as Mo, Flo's mother and Jo's grandmother who was the founder of Mo's Oasis Cafe. She died before the events of the series.
• Laura Bailey and Travis Willingham as Jane & Lionel Mulligan, Kid's deceased parents who were killed in a car collision by a semi-truck before the events of the series. Their deaths were so horrible that Kid was traumatized after that incident and said the lethal accident was what caused Kid to dream of being a superhero. Additionally, Kid has developed PTSD and has occasionally shown signs of it in the series. They, like their son, liked superheroes and Kid's mother made the cape that Kid always wears, even today. They appeared in the third season as the final illusion Kid has to confront, realizing, with the help of Papa G that they were trapped in an illusion world created by Fantos and Kid's imagination.
• Angela Lansbury as Fantos' mother, an elderly alien woman who is the mother of Fantos who he lives with and goes to for emotional support. In the second-season finale "The World is Saved", she dumps his belongings and leaves her son on Erodius. In episode five of the third season titled "The Planet Killer", she is shown in a fantasy world, regretting her decision.
• Rich Fulcher as Zarkon,^[7] a small green alien and an adversary of Kid and his friends. Despite being easily able to defeat the Local Heroes and take the stones, he ends up getting electrocuted to death when he flies into a power line.
• Jennifer Hale as I.R.I.S (Integrated Robot Intelligence System), a female robot who controls everything in the PPG headquarters. In the episode "The Global Conspiracy", she became a robot, later Jo mentioned Carl staked I.R.I.S's "vampire" robot heart.
• Ike Amadi as Crispin Clearly, chief officer of the B.C.E.I.T.A.A (Bureau of Cosmic Events, Intergalactic Threats and Alien Affairs). He appeared in the series finale episode "The Grand Opening of Planet Earth" because he was sent by the I.C.P.P.P.P.E (International Council of Protection and Propagation on Planet Earth) to thank the Local Heroes for saving Earth from Erodius. But he forbids them from telling the world about their superhero adventures.
• Jack McBrayer as Skippy Olsen, an agent who works with the PPG and Kid's best pal who wanted to be like him. He appeared in the episode "The Secret of the Fourteenth Stone". He tricked the team that there was a fourteenth stone.

Season 1: The Local Heroes! (2021)

Each episode was directed by Craig McCracken, but various others co-direct with him.

Season 2: The Intergalactic Truckstop! (2021)

Justin Nichols and Dave Thomas directs every episode, aside from "Kid Cosmic and the Pyramid Puzzle of Pain", which was solely directed by Thomas.

Season 3: The Global Heroes! (2022)

Like most of the previous season, Justin Nichols and Dave Thomas directed every episode.

Design and themes

The main setting of the show, an arid landscape with a "generic rural southwest desert vibe", is presumed to be New Mexico. However, McCracken said in an interview for Den of Geek: "It could be New Mexico, it could be California [or] it could be Arizona. Basically it's a remote enough place where a spaceship could crash and not a lot of people would know about it."^[19]

Stylistically, the show is meant to resemble the visual look of classic comics such as Hank Ketcham's Dennis the Menace and Hergé's The Adventures of Tintin,^[1][3] where every action is grounded in reality: "A lot of the choices that we made in Kid were based on the fact that these are real people in the real world [...] So with the animation we avoided overly smooth and flowy actions or lots of squash and stretch, things that you associate with cartoons," McCracken said.^[19] Stuck Chuck's design is a nod to the aliens from the 1996 film Mars Attacks! and other science-fiction movies.^[20] Spaceships, cars, and major locations like Mo's Oasis Café are often represented by 3D models.^[21]

McCracken affirmed that some of the ideas explored within the show are also based on things that he personally experienced, such as the loss of his father at the age of 7, similar to the protagonist, who lost both of his parents.^[11] The dynamics between Kid and Jo are loosely based on McCracken's relationship with his older sister and are similar to those of Mac and Frankie in Foster's Home for Imaginary Friends.^[20] Rosa's "playful spirit" is also a reflection of the creator's young daughter.^[1][6]

Kid Cosmic also plays on the theme that "heroes help, not hurt", which means the characters often show a compassionate attitude toward their adversaries.^[11] This strays in tone from McCracken's first popular work, The Powerpuff Girls, which he described as a "campy parody of superheroes".^[11] He declared: "I really didn't want to tell a story to kids that said, 'Hey, if you get great powers, then you can go and beat up bad guys and be violent and win.' I didn't want that to be the message. So I asked myself what a real hero is".^[11]

Awards and nominations