Henry Hart is a 13-year-old boy who lives in the town of Swellview. He lands a part-time job as Kid Danger, a sidekick to the superhero well known in Swellview as Captain Man. Captain Man tells Henry not to tell anybody about his job, so he keeps it a secret from his best friends Charlotte, who eventually discovers the secret, and Jasper, who also eventually discovers the secret through a misunderstanding, his younger sister, Piper, and his parents. Henry goes to a shop called "Junk 'n' Stuff", which has a secret lair called the Man Cave hidden underneath where Captain Man does his work. Captain Man says he will not be around for long and needs help; soon enough, he will need someone to take his place when he is gone.
Main characters, from left to right: Piper, Captain Man (Ray), Henry (Kid Danger), Charlotte and Jasper (use cursor to identify)
- Henry Hart (Jace Norman) is a 13-year-old boy who becomes the sidekick of Captain Man. He is an average kid with friends and an after school job as Captain Man's superhero sidekick. Thanks to his skills and gadgets, Kid Danger has no problem helping Captain Man on his missions. He will always be with his friends even if he has to go save the world. In "Hour of Power", Henry gains super-quick reflexes during the fight against Captain Man's former sidekick Drex.
- Captain Man (Cooper Barnes) is a superhero who trains Henry. About 25 years ago, Ray Manchester's scientist father Dr. Carl Manchester accidentally pulled a lever on his Trans-Molecular Densitizer that Ray crashed into when riding his skateboard causing him to be indestructible and yet can still feel some pain for a short time. Now he is a crime-fighting superhero. He needed a sidekick, so he chooses Henry. Captain Man's Man-Cave is located underneath "Junk 'n' Stuff". Ray is shown to have a crush on Mrs. Hart despite the fact that she is married, which sometimes irritates Henry and he tries to force Ray to go do something else for the time being.
- Charlotte (Riele Downs) is one of Henry's best friends. She is sarcastic, clever, and smart. She is the "sass master" of the bunch, always there to snap everyone back to reality. She and Henry have been best friends for a long time and therefore she is close enough to him to tell it like it is. She is a big fan of Captain Man. In the fourth episode, Charlotte figures out Henry's secret and gets a job as Henry and Ray's manager.
- Jasper (Sean Ryan Fox) is one of Henry's best friends. He is full of ideas, but most of them are not good. He has been Henry's best friend since preschool. He is a bucket collector who always embarrasses Henry and Charlotte. He also asks a lot of questions and is a big fan of Captain Man as well. In the episode "I Know Your Secret", Henry reveals to Jasper that he is Kid Danger, and is taken into the business.
- Piper (Ella Anderson) is Henry's little sister who is a fan of Captain Man. She and Henry are not that close. Piper claims that she hates her life and overreacts to various issues mostly about social media. Piper is also shown to be annoyed with Jasper's antics and seems to have a big rivalry with him.
- Mr. Hart (Jeffrey Nicholas Brown)[Note 1] is Henry and Piper's father.
- Mrs. Hart (Kelly Sullivan)[Note 1] is Henry and Piper's mother.
- Oliver (Matthew Zhang) is a strange and quirky boy. He is the best friend of Sydney and shares a similar interest in odd clothing.
- Sydney (Joe Kaprielian) is a boy who shares similar personality traits with his best friend Oliver.
- Mr. Gooch (Duncan Bravo) is the cashier at "Junk 'n' Stuff" who works with Captain Man. He alerts Captain Man of any dangers in Swellview. He also has a young nephew named Benjy and a pet carnivorous plant named Omar.
- Schwoz (Michael D. Cohen) is a worker for Captain Man who handled the equipment in the man cave as he was the one who built it. Ray and Schwoz's friendship was strained when Schwoz stole Ray's girlfriend. They eventually made up when Henry convinced Ray to forgive Schwoz. Since then, Schwoz has come up with various inventions to help Captain Man and Kid Danger, though at times he can be weird and funny, which makes Henry and Ray furious. He sometimes refers to his sister as someone who looks like a horse. He also had a shape-shifting android as his "girlfriend".
- Trent Overunder (Winston Story) is the newsman on KLVY who reports on the activities in Swellview, which include Captain Man's heroic activities.
- Mary Gaperman (Carrie Barrett) is the co-anchor of Trent at KLVY.
- Miss Shapen (Jill Benjamin) is Henry's history teacher at Swellview Junior High. She is known to ask Henry for advice on dating as she could never get a successful fate. In "Double Date Danger", it is revealed that Miss Shapen has a niece named Noelle who worked for Drill Finger.
- Mitch Bilsky (Andrew Caldwell) is a school bully who picks on Henry.
- Dr. Minyak (Mike Ostroki) is a mad scientist who is possibly Captain Man's nemesis.
- Van Del (Josh Fingerhut) is a criminal who is the leader of the Wall Dogs graffiti gang.
- The Time Jerker (Joey Richter) is a criminal who makes use of his time machine, and makes a lot of time related puns.
- The Toddler
Main article: List of Henry Danger episodes
|First aired||Last aired|
|1||25||July 26, 2014||May 16, 2015|
|2||18||September 12, 2015||July 17, 2016|
|3||TBA||September 17, 2016||TBA|