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.

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.

When Tim is celebrated for accidentally inventing a pencil holder, Flint gets jealous and starts to doubt his own skills as an inventor.

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.

Flint creates an invention to take out the garbage, but it soon starts deciding for itself what, and who, counts as garbage.

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.

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.

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.

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.

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.

Flint is excited to discover there's another inventor in town, but Sam suspects the inventor has an ulterior motive for befriending Flint.

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.

Tim drags Flint out into the wilderness to participate in a Lockwood father-son tradition: catching the legendary Sardemon, the largest sardine in existence.

Earl goes undercover as a female student named "Pearl" in order to befriend Sam and find out what Flint's planning to invent next.

Sam is determined to stop Swallow Falls' annual sardine race, which she firmly believes is animal cruelty.

When they are teased for being too similar, Flint and Sam try to prove that they are totally different.

When Flint accidentally combines himself with Steve, he must learn to live with the monkey inside him.

After hearing Flint brag about sleep-inventing the best invention ever, the Mayor sees it as a money-making opportunity.

In trying to keep Sam from moving away, Flint accidentally animates the town's sardine statue, and it begins spilling the town's secrets.

Flint gives Sam a Cloud-Maker for the anniversary of their friendship, but Sam's new cloud friend will not leave her side.

In a bid to make his classmates consider his idea for a science mural, Flint creates a toot-inducing bean.

After being inured by one of Flint's inventions, Tim's doctor wants him to relax, and Flint has just the thing to help.

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.

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.

Sam and Flint accidentally cryogenically freeze themselves in the town's time capsule, and emerge into a post-apocalyptic future.

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.

Steve falls in love with the cymbal-smashing electric monkey Flint brought in to replace Steve while he was on vacation.

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.

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.

Flint accidentally makes a clone of himself, and is shocked to discover his clone is more popular than he is.

Sam makes Flint a new tricked-out labcoat to replace his old smelly one, not realising it was a gift from his mom.

When Flint gets Earl in trouble with his wife, Earl demands Flint help him get back into her good graces.

Flint builds a spaceship for an Australian businessman, Mr. Zorbleck, who may or may not actually be Australian.

Tim's brother, Jim, comes to visit.

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.

While attempting to debunk Hollywood pseudoscience, Flint accidentally creates his own Frankenstein-like monster.

Flint shares his tale of how he invented Ratbirds.

Flint is made a tempting offer when he sells his inventions at a yard sale.

Flint feels obligated to help out another inventor in town.

Brent is furious when Flint and Sam expose that he is no longer a baby.

Flint and Sam find a lost cat, and Sam sabotages efforts to find the owner so she can keep it.

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.

Flint decides to have some fun when he is in charge of a birthday piñata.

Flint is fooled into creating a fish-cyborg army for Mayor Shelbourne.

Flint tries to get his father to eat healthier by inventing a spray to make Tim love fruits and vegetables.

Sam discovers and spills the beans that the Mayor's first name is Tootsie.

Frustrated that the town doesn't appreciate the beauty around them, Sam makes Flint invent something to force them to do so.

Flint asks Sam to train him for the annual father/son horseshoe contest, which uncovers Sam's troubled past with the sport.

Flint introduces Sam to Swallow Falls' unique Christmas traditions, centered around the mythical Lobster Claus.

Flint invents a time machine to make his father like desserts.

Flint and Sam move to the other side of the island to take up an inventing-free life.