The Danger Begins est un épisode en deux parties qui commence la première saison de Henry Danger . La première a eu lieu le 26 juillet 2014 devant 1,94 million de téléspectateurs. 
25 years ago, in 1989, a scientist named Carl Manchester shows his subjects his invention, which made glass indestructible. It was “Take Your Kid To Work” Day and he had brought his son, Raymond. As the scientist, his co-workers, their kids leave, Ray accidentally skateboards into his dad’s invention, while pulling the lever. Ray becomes an indestructible superhuman. Now, a 13-year-old boy named Henry Hart (Jace Norman) is trying to find a job online so that he can make money. His best friend, Jasper (Sean Ryan Fox) is trying to get people to come to his birthday party and his other best friend, Charlotte (Riele Downs) is trying to focus on Algebra. Then, Henry's mom, Kris, comes in and says that she has a question about Henry’s underwear. Charlotte and Jasper are amused while Henry is embarrassed. Henry’s 9-year-old little sister, Piper (Ella Anderson), comes in, upset because Jessica had unfollowed her. Charlotte then sees that there was a job at Junk-N-Stuff that didn’t require skills, which Henry lacked in.
Henry goes over to Junk-N-Stuff. It was filled with a bunch of extremely strange things. The cashier, Gooch, tells him to go to the elevator and go down. When Henry goes in the elevator, he sees only two buttons: one for up and one for down. He hits the down button and the elevator plunges downwards extremely fast. There, he sees Ray (Cooper Barnes), who was now an adult superhero going by the name of Captain Man. Ray then chews bubble gum and blows a bubble. The bubble puts him in his Captain Man costume. Then, a man comes in disguised as an old lady. Henry sees a tattoo on the man’s neck and recognizes him as an intimidating man that was on the first floor. Henry runs toward the man. The man zaps Captain Man and he passes out. Henry defeats the man and shoves him in the elevator. However, Captain Man turned out to be fine and the “villain” worked for Captain Man and he was just helping him test Henry and see if he qualified for the job. Captain Man hires Henry as his sidekick and pays him nine dollars an hour. He gives him a bracelet and that would be how they would contact each other. If the bracelet beeped once, it meant nothing, if it beeped twice, it was important, and if it beeped three times, it meant going out and fighting crime. Then, they see a video of a real supervillain known as The Toddler. They find out that he had made a bridge collapse and that there were cars in the ocean. They go up their tubes and save everyone.
At home, Jasper gives Henry an app for his phone that played a bunch of random sound effects like a school bell, a cat hacking on a hairball, or an ice cream truck. Meanwhile, it gets out that Captain Man was the one who saved everyone and he had not been working alone. He had been accompanied by an accomplice known as “Kid Danger” (Henry). Jasper and Charlotte know about this, making Henry extremely nervous. Then, Henry’s bracelet begins beeping three times. He claims that the bracelet for the muffins he was making for Jasper’s party. He goes to Junk-N-Stuff and sees Ray getting a ukulele lesson. After his teacher leaves, Ray explains to Henry that yesterday, when they were pulling people out of the water, The Toddler had poisoned a bunch of diapers. Now, if a baby peed in a diaper, they would turn into tiny, evil monsters. They now had to go over and defeat The Toddler, but it had to be done on the same night as Jasper’s birthday party. Henry says that he has to go to the party since Jasper was his best friend, so Ray has to go over and try to defeat The Toddler himself.
That night, he watches the news and discovers that Captain Man had been captured by an unknown supervillain. Henry knew that it was The Toddler. He goes over to the place Captain Man was, having to skip Jasper’s party. He sees that Captain Man was being hung by a baby swing and getting spun around repeatedly. He gets a pack of gum Captain Man had given him. He begins to chew one and blows a bubble. Henry gets put in his costume. He plays the ice cream truck sound, distracting The Toddler and his henchman. They leave and after that, Henry comes in and Captain Man tells him to pull a lever on the wall. However, The Toddler and his henchman return and see Henry. He quickly pulls the lever and Captain Man’s baby swing starts moving around. He takes advantage of this by using his legs to kick the henchmen. Henry begins fighting them, too. Once all of the henchmen are unconscious, The Toddler pulls out a bottle with an explosive liquid inside. Captain Man tells Henry to leave but Henry refuses. The Toddler closes all the doors, but then, Henry pushes Captain Man towards The Toddler. Captain Man kicks him into an endless ball pit and he is destroyed. Henry then throws the explosive into the ball pit and it explodes, completely killing The Toddler.Henry then asks Captain Man if he could “happen” to show up at Jasper’s birthday party. Captain Man agrees. Jasper and Charlotte meet Captain Man, and Henry pretends to be meeting him for the first time. They start texting everyone that Captain Man was at the party and the party is a hit. They kill the lights and sing Jasper a happy birthday song. He blows out the candles on his birthday muffin, but when they open the lights, they see that Captain Man was gone. He had left to fight crime. As everyone begins dancing, Henry’s bracelet flashes three times. He puts a stick of gum in his mouth, transforms and leaves the party.
- Jace Norman as Henry Hart (Kid Danger)
- Cooper Barnes as Ray Manchester (Captain Man)
- Sean Ryan Fox as Jasper Dunlop
- Riele Downs as Charlotte Page
- Ella Anderson as Piper Hart
- Duncan Bravo as Gooba Gooch
- Matthew Zhang as Oliver Pook
- Joe Kaprielian as Sidney Birnbaum
- Kelly Sullivan as Kris Hart
- Jeffrey Nicholas Brown as Jake Hart
- Ben Giroux as The Toddler
- Colby Severance as 8 year-old Ray Manchester
- Meghan Maureen McDonough as TV News anchor
- John Burke as TV Reporter #1
- Craig Tsuyumine as TV Reporter #2
- Brendan Ford as Carl Manchester
- Max Daniels as Boris
- Sophie Sabatini as Girl #1
- Alisa Allapach as Laylani
- This is the first hour long episode.
- This is also known as the first and second episode. Most Nick hour long episodes are counted as two separate episodes, like Henry and the Bad Girl.
- Nickelodeon promoted the premiere as a movie.
- Every main cast member's name is shown when their respective character is talking, excluding Cooper Barnes.
- In the first scene, a Pearbook can be seen (originally from Sam & Cat, Victorious, iCarly, Zoey 101 and Drake & Josh). Also, Wahoo Punch can be seen on the counter.
- In the episode, Henry is using a Pearbook. However, in the promo, this isn't a Pearbook, a circle is shown instead.
- On the closeup of the Pearbook, Hungry Girl, the show that Dan Schneider's wife, Lisa Lillien, runs, can be seen on the right side of the screen.
- The birthday song Henry sang was the same song from the Sam & Cat episode "#BrainCrush".
- When Captain Man laughs at Jasper, it was similar to how Rex from Victorious laughs at people.
- The line "That was my favorite bridge" was almost cut due to time.
- The Dampers diapers are a parody of Pampers.
- This episode does not have the theme song and is the first one to not do so. Also, the end credits show scenes with an effect, unlike the others episodes that show the scene like they were in the episode.
- If we cut the episode in two, this is the first episode with a main character absence, because Piper does not appear at all in the second part.
- Mr. Gooch's straw he was drinking out of is shaped as "CM", Captain Man's initials.
- In the Man Cave, the Auto Snacker reads Food-O-Matic while in later episodes it reads Auto Snacks.
- This is the only episode that Jasper's cat is mentioned in.
- In Double Date Danger he states that he doesn't have any cats, which could be a continuity error, or his cat died sometime after this episode.
- During the episode, Ray zaps Henry’s phone when he tries to text his friends, which destroys it. Later on in the episode, it is revealed that he bought a new phone, only this time it is a red PearPhone.
- 15 November, 2014 (Australia)
- 15 November, 2014 (Austria)
- 15 November, 2014 (Belgium)
- 22 January, 2015 (Latin America)
- 16 November, 2014 (Denmark)
- 15 November, 2014 (Germany)
- 15 November, 2014 (Netherlands)
- 15 November, 2014 (Norway)
- 15 November, 2014 (Poland)
- 6 January, 2015 (Portugal)
- 15 November, 2014 (Sweden)
- 15 November, 2014 (Switzerland)
- 13 February 2015 (United Kingdom & Ireland)
- 23-24 March, 2015 (France)
- 2 March, 2015 (Spain)