Chuckie becomes mortally afraid of slides after making the mistake of going down a slide designed for older children; the babies visit a giant indoor pool.
The babies pile into Grandpa's trailer to go find Chuckie's rocket ship that has crash landed on the moon; Angelica loses her excitement for her birthday.
Grandpa's sister, with whom he has unresolved childhood issues, comes to visit; Arnold and his friends join Coach Wittenburg's synchronized swimming team.
Helga attempts to impress Arnold by using a coupon in order to take him out to a fancy restaurant; Phoebe has issues with her new peers after skipping a grade.
Arnold and Gerald attempt to avoid their performing obligations for Helga's musical by traversing the city in a public bus but end up getting lost downtown.
When Helga is not invited to a slumber party, she gives herself a beauty treatment; Arnold is in the middle of a dispute concerning a neighborhood building.
Grandpa brings his favorite classic car in order to display it an antique car show, where he is shocked to discover that is has been stolen from plain sight.
The kids take home security to a new level to avoid getting in trouble by dad; Clyde tries to help Lincoln recreate his childhood photos after he erases them.
Lana and Lola secretly switch places and pretend to be the other; the kids sneak a hurt Flip into the attic to care for him without Mom and Dad knowing.
Liam becomes the star pitcher for the middle school baseball team; Lincoln's friends try to stop him from performing a magic act at the school talent show.
The sisters suspect that Lincoln is bad luck, and ban him from all their activities; Lincoln and Lana try to save some frogs before they are dissected in class.
Luan tries out for the school play in order to get closer to her crush, Benny; when Clyde and Zach bond over antiques, Lincoln feels like a third wheel.
Lisa invents lie-detecting glasses to try and find out who lying; when Lincoln asks to borrow Clyde's new gaming system, Clyde struggles to trust him with it.
When Lily and Jack realize they must sacrifice their summer plans, they create a new chaotic normal that starts with a runaway trailer they have to save.
When Henry and the other kids destroy Ray's movie prop, they travel to an alternate universe using Bill Evil's inter-dimensional transporter and steal it.
When Captain Man and Kid Danger create a profile on a matchmaking app for heroes and villains, they set up a double-fight to square off with some new villains.
Charlotte and Henry become suspicious of the new student and convince Captain Man to become an undercover substitute teacher to get to the bottom of it.
When Henry and Ray see the new Kid Danger and Captain Man cartoon, they find that it is horrible, so they try to fix the cartoon before the big premiere party.
When Piper's school parrot Otto repeats that Henry is Kid Danger, Henry and Jasper have to stall, until Ray, Charlotte and Schwoz can find a way to fix things.
When Miss Shapen's niece visits town and picks Jasper instead of Henry, Henry finds out that Noelle has more planned than just going to dinner with Jasper.
When Henry's father gets a new job offer in Bordertown and they have to move, Henry and Ray go undercover to try and stop Henry's dad from getting the job.
Charlotte's unique invention for The Gizmo Show is accidentally destroyed, however she worries the attention that she is getting could expose the identities.
Kid Danger and Captain Man take on a villain who has a time machine, and after the young sidekick falls into the device, he experiences the same day repeatedly.
When a tabloid reports that Kid Danger's superpowers are the result of an illness, Henry tries to convince Swellview that it is a big misunderstanding.
When Raymond thinks his sidekick Henry is faking being sick, he then installs hidden cameras and microphones all over Henry's house in order to catch him.
When an atomic bomb is accidentally activated in the Man Cave, Ray and Henry decide to take the bomb out into Swellview desert in order to save their city.
When a dormant volcano beneath Swellview suddenly becomes active, Henry and Ray fear the worst; Piper suspects that she has a dietary intolerance to gluten.
Angelica thinks a cosmetic cream will make her, Tommy, and Chuckie invisible; Chuckie feels guilty and doesn't want to play anymore when the babies break glass.
Tommy gets terrified of the local playground after a slip of his hand, but Angelica's teasing inspires him to try again in order to best her claims of bravery.
Arnold tries to take advantage of the fact that Gerald's younger sister has developed a crush on her; Eugene rebels against creative liberties in a play.
Grandpa goes back to school so he can actually graduate; Mr. Simmons partners up his students and tells them to take care of an egg to teach responsibility.
Grandpa and Big Bob are at each other's throats when their vehicles collide, and it is decided that a round of golf will determine who pays for damages.