Main • Joseph "Joey" Felt (voiced by
Eric Bauza) is the main
protagonist of the series. He is a 12-year-old comic book fan. Through a chance turn of events, he develops the ability to combine with his superhero idol, and together they form a new hero, Atomic Puppet. • Captain Atomic/Atomic Puppet/AP (voiced by
Eric Bauza) was a world-renowned superhero who lived his life being able to handle situations with his brute strength and endless charm. Blinded by success and fame, he is transformed into a powerless, blue
sock puppet living by his jealous sidekick Mookie. Now he goes by the name AP and, due to his massive ego and short temper, struggles with adjusting to his new life as a puppet and the fact that he can only access his former powers when Joey places him on his hand, turning them into Atomic Puppet.
Supporting • Pauline Bell (voiced by Lisa Norton) is Joey's best friend and the only person other than Mookie and the other superheroes that knows of Joey's secret identity. Pauline occasionally covers for Joey when he needs an excuse to become Atomic Puppet, and has fought alongside Atomic Puppet if the situation called for it. She has a job at a comic bookshop owned by her uncle. • Philip "Phil" Felt (voiced by Carlos Díaz) is Joey's burly, rugged, no-nonsense father. He's impatient, opinionated, and does everything he can to counteract his wife's babying of the kids. During the final episode, he learns the truth about Joey and AP. • Vivian Felt (voiced by Kristina Nicoll) is Joey's sweet but overly caring mother. She worries far too much about her children and is always concerned about what kind of trouble they could get into. • Abigail Felt (voiced by
Katie Griffin) is Joey's energetic 8-year-old sister who goes by the nickname "Abs" or "Abbie". • Bubbles is an orange
tabby cat and the family's slow-witted, overweight, and flatulent pet. AP refers to him as Disastro and is convinced that Bubbles is an undercover villain plotting to take down Atomic Puppet from the inside, while Phil completely adores Bubbles, describing him as "the most adorable kitty-kat in the world". • Rex Bordeaux (voiced by David Huband) is the egotistical host of Mega City news. As the city's #1 newsman, he climbed his way to celebrity status by reporting on the feats of Captain Atomic, but his reputation is in danger of slipping with Captain Atomic's "disappearance".
Villains • Sergeant Subatomic: The Nuclear Boy (Mookie) (voiced by
Peter Oldring) is the main
antagonist of the series. Mookie is Captain Atomic's bitter and envious former sidekick and is responsible for his transformation into a puppet, done in an attempt to replace him as Mega City's protector. While Mookie does have a wide assortment of gadgets to use, by himself, he's nothing more than a glory hound that lives in his mother's basement. He frequently tries to force the citizens of Mega City to accept him as their hero, but his incompetence and lack of superpowers fail to win them over. • Professor Tite-Gripp (voiced by
Rick Miller) is a cunning and ruthless criminal with massive mechanical hands that give him superhuman strength. He was originally Captain Atomic's archenemy and is now Atomic Puppet's most dangerous foe. • Naughty Kitty (voiced by
Heather Bambrick) is a female thief who wears a black cat costume and steals cats. She is a parody of
Catwoman. • Zorp (voiced by
Robert Tinkler) is a green-skinned alien invader who intends to capture the citizens of Mega City and eat them. He is often accompanied by a smaller alien of his species known as Flert. • Mudman (voiced by
Robert Tinkler) is a humanoid creature made of mud who can change his shape and possess others by smothering himself over them. He has a cousin named Dirtbag, a large sack-like creature able to breathe blasts of soil, who has also tangled with Joey and AP. • Ms. Erlenmeyer/Queen Mindbender (voiced by Kristina Nicoll) is Joey's bitter science teacher who is driven to madness by AP when he attempts to stop her from putting Joey in detention. Afterward, she marries a mysterious alien and is transformed into a green-skinned telepath named Queen Mindbender. • The Were-Chicken is a mutant chicken who appears in "Something Chicken" as the main antagonist. • Commander Atomic and Puppet Boy are a pair of opposite villains in the episode "Parallel Puppet", who both serve as the main antagonists.
Heroes • Justice Alliance is a superhero team that protects the galaxy at large. Prior to his transformation, Captain Atomic was a member, and he has rejoined as Atomic Puppet. • Commander Cavalier (voiced by
Robert Tinkler) is a hero with heat vision powers. He is extremely obsessed with his appearance, to the point where showing him a mirror will always cause him to stop and admire himself. • Robo-Ron (voiced by
Martin Roach) is a
cyborg superhero who only speaks in
beatbox and printed messages. Although he possesses a wide range of gadgetry and is incredibly intelligent, he is considered the least powerful member of the alliance. • Crimson Beacon is a quiet superhero with flaming hair, resembling
Firestorm. It has the ability to create almost anything, similar to
Green Lantern. • Princess War Tickle (voiced by Kristina Nicoll) is a superheroine, very similar to
Wonder Woman who dwells in a magical castle in the sky. She has an ongoing rivalry with Captain Atomic, as she is the only hero who rivals Captain Atomic in power and fame. • Dyna-Moe: A friendly country superhero who left town after he failed to defeat Dirtbag. The mayor used him as part of a scheme to get rid of AP and Nuclear Boy permanently, only for Dirtbag to show up.
Others • Rudolph Mintenberg (voiced by
Scott McCord) is an eccentric billionaire who lives in a hilltop mansion outside Mega City. He is constantly bored and entertains himself by with a variety of dangerous gadgets and experiments, forcing Joey and AP to step in and save the day. • Warren Beasley (voiced by Mark Edwards) is a nosy nerd who lives next door to Joey. His hobby is spying on his neighbors and classmates. • The Mayor (voiced by
Kevin Hanchard) is the mayor of Mega City. He often tries to replace Atomic Puppet because he dislikes the collateral damage they cause in their battles against their various foes. ==Episodes==