Episode 1
Flint and Sam reminisce about the first time they met when they went head-to-head at the school science fair and nearly destroyed the town.
Episode 2
Flint begs Sam to let him see her most treasured possession, but when Sam relents Flint damages it and has to find a way to make it up to her.
Episode 3
When Tim is celebrated for accidentally inventing a pencil holder, Flint gets jealous and starts to doubt his own skills as an inventor.
Episode 4
Flint invents a way to make sardines taste like bacon so Sam can eat one without gagging, but Flint's invention has a few bacon-related side-effects.
Episode 5
Flint creates an invention to take out the garbage, but it soon starts deciding for itself what, and who, counts as garbage.
Episode 6
Swallow Falls prepares to celebrate the birthday of its oldest sardine, a wish-granting fish named Johnny, but Flint and Sam put the entire event in jeopardy.
Episode 7
When Steve wins the Swallow Falls lottery, townspeople line up claiming that they are Steve's best friend causing Flint to question Steve's true affections.
Episode 8
Flint and Sam babysit so they can buy a new board game, but when Brent hires them as his babysitter they have to decide whether the humiliation is worth the reward.
Episode 9
Flint modifies Sam's weather-predicting orb to predict the future, but knowing their future isn't as fun as they thought it would be.
Episode 10
Mayor Shelbourne brings a panda to Swallow Falls, but when the town falls under the panda's spell it's up to Flint and Sam to find out what's really going on.
Episode 11
Flint is excited to discover there's another inventor in town, but Sam suspects the inventor has an ulterior motive for befriending Flint.
Episode 12
To stop himself from being late for school, getting into more trouble, and missing all the fun, Flint decides to create a robo-rooster alarm from getting late for school.
Episode 13
Tim drags Flint out into the wilderness to participate in a Lockwood father-son tradition: catching the legendary Sardemon, the largest sardine in existence.
Episode 14
Earl goes undercover as a female student named "Pearl" in order to befriend Sam and find out what Flint's planning to invent next.
Episode 15
Sam is determined to stop Swallow Falls' annual sardine race, which she firmly believes is animal cruelty.
Episode 16
When they are teased for being too similar, Flint and Sam try to prove that they are totally different.
Episode 17
When Flint accidentally combines himself with Steve, he must learn to live with the monkey inside him.
Episode 18
After hearing Flint brag about sleep-inventing the best invention ever, the Mayor sees it as a money-making opportunity.
Episode 19
In trying to keep Sam from moving away, Flint accidentally animates the town's sardine statue, and it begins spilling the town's secrets.
Episode 20
Flint gives Sam a Cloud-Maker for the anniversary of their friendship, but Sam's new cloud friend will not leave her side.
Episode 21
In a bid to make his classmates consider his idea for a science mural, Flint creates a toot-inducing bean.
Episode 22
After being inured by one of Flint's inventions, Tim's doctor wants him to relax, and Flint has just the thing to help.
Episode 23
After encouraging Mr. Earl to have a day off, Sam and Flint learn he is too bored, and try to make things better for him.
Episode 24
Flint invents the hair unbalder when he realises he'll go bald one day, but Tim offers him another point of view by showing him the perks of being bald.
Episode 25
Sam and Flint accidentally cryogenically freeze themselves in the town's time capsule, and emerge into a post-apocalyptic future.
Episode 26
Flint invents a device that will put a good picture of him into the yearbook, but it also puts him in every picture that has ever existed.
Episode 27
Steve falls in love with the cymbal-smashing electric monkey Flint brought in to replace Steve while he was on vacation.
Episode 28
Flint enters his fearsome robot into a robot boxing competition, and when it comes face to face with Mayor Shelbourne's robot, the results are explosive.
Episode 29
Flint and Gil argue over who has a better dad, setting off a secret competition pitting Tim and Mayor Shelbourne against each other, in a battle of parental prowess.
Episode 30
Flint accidentally makes a clone of himself, and is shocked to discover his clone is more popular than he is.
Episode 31
Sam makes Flint a new tricked-out labcoat to replace his old smelly one, not realising it was a gift from his mom.
Episode 32
When Flint gets Earl in trouble with his wife, Earl demands Flint help him get back into her good graces.
Episode 33
Flint builds a spaceship for an Australian businessman, Mr. Zorbleck, who may or may not actually be Australian.
Episode 34
Tim's brother, Jim, comes to visit.
Episode 35
Mayor Shelbourne buys up all the town's candy at Halloween and promises to give it all to the kid who makes it through his super scary haunted house.
Episode 36
While attempting to debunk Hollywood pseudoscience, Flint accidentally creates his own Frankenstein-like monster.
Episode 37
Flint shares his tale of how he invented Ratbirds.
Episode 38
Flint is made a tempting offer when he sells his inventions at a yard sale.
Episode 39
Flint feels obligated to help out another inventor in town.
Episode 40
Brent is furious when Flint and Sam expose that he is no longer a baby.
Episode 41
Flint and Sam find a lost cat, and Sam sabotages efforts to find the owner so she can keep it.
Episode 42
When Sam predicts that a meteoroid will crash into Swallow Falls, she and Flint have to find a way to move the island out of its way.
Episode 43
Flint decides to have some fun when he is in charge of a birthday piñata.
Episode 44
Flint is fooled into creating a fish-cyborg army for Mayor Shelbourne.
Episode 45
Flint tries to get his father to eat healthier by inventing a spray to make Tim love fruits and vegetables.
Episode 46
Sam discovers and spills the beans that the Mayor's first name is Tootsie.
Episode 47
Frustrated that the town doesn't appreciate the beauty around them, Sam makes Flint invent something to force them to do so.
Episode 48
Flint asks Sam to train him for the annual father/son horseshoe contest, which uncovers Sam's troubled past with the sport.
Episode 49
Flint introduces Sam to Swallow Falls' unique Christmas traditions, centered around the mythical Lobster Claus.
Episode 50
Flint invents a time machine to make his father like desserts.
Episode 51
Flint and Sam move to the other side of the island to take up an inventing-free life.
Episode 52
