Tom and Annie try to decipher coded messages to find out who's sending them.
"The show must go on" when school-play director Paul finds out someone is trying to ruin his production by sabotaging the special effects.
The twins use their knowledge of sound to rescue a stolen pup.
Tom, Annie & Paul try to get ideas of how to celebrate their parents wedding anniversary. Annie reads in the paper that former rock star Chops Dorfman is appearing in town to shoot a movie. Paul gets the idea to get Chops to perform since he was a famous rocker in his parents days. Paul visits Chops @ the hotel he's staying. He spots him & hides in the limo. When Chops discovers him, he stops the limo while Paul explains everything. Paul also hires a garage band (Jake & The Pharos) to play for the anniversary as well. But the band's instruments get repossessed. When Tom makes instruments out of everyday objects, the band bails out just as Mom & Dad arrive. Just as things look bleak, the doorbell rings & Paul's surprised that it's Chops Dorfman himself. He plays the guitar & sings a tune while the kids back him up on junk instruments.
The twins try to expose séances intended to scam a woman out of her savings.
When the twins and Paul get lost searching for hidden treasure, Tom improvises a compass to help them find their way.
Tom and Annie use the principles of color theory, light and reflection to prove a boy innocent of arson
The twins use an infrared camera to identify a thief who kidnapped Paul.
Tom and Annie's experiment with animation convinces their brother Paul that he's seen a UFO.
Using their knowledge of physics, Tom and Annie improvise a device to help a swimmer win a race.
The twins improvise a pulley to rescue their brother after he falls down a steep hill.
Tom and Annie put aside their bickering with twin cousins to help Paul solve a problem.
Tom's robotic invention goes haywire after Paul borrows it to let himself into a junkyard.
Paul frees a boa constrictor that Tom is looking after---hours before their mother's dinner party.
An extensive search begins after Paul gives away a coin that was in Tom's safekeeping.
Tom and Annie accompany Paul into a supposedly haunted house.
The twins try to catch the culprit who's been polluting the local pond with toxic waste.
After Paul returns a money clip he found, he becomes unsure if he's given it to the rightful owner.
Tom and Annie investigate when a woman develops an interest in Paul's photo negatives.
The twins investigate messages Paul claims to have received through his guitar amplifier.
Paul unwittingly creates an explosive substance while working on a cure for his hiccups.
Annie is determined to break a speed record for tricycles and enlists Tom's help in designing a winning trike.
Tom loses a model rocket in which he installed his father's valuable altimeter.
Part 1 of 3. During a visit to the Davidsons' ranch, the Edisons investigate the disappearance of a horse named Rescue.
Part 2 of 3. Tom gets information on the whereabouts of a missing horse.
Tom's search for a missing horse leads him to a harbor where a horse matching Rescue's description was seen being put on a ship bound for a foreign destination.
Annie goes to bat for her baseball team when a guest cancels an appearance at its fund-raiser.
Annie becomes concerned when her best friend starts dieting excessively while training for an important footrace.
Annie and Tom enter a baking contest and cook up very different ways to make a cake.
Tom and Annie try to uncover the identity of a monkey that mysteriously slipped into their house.
Tom and Annie draw on their knowledge of chemistry to investigate a possible art forgery.
A scientific team overshadows Tom's attempts to photograph a solar eclipse.
Annie tries to pull the plug on Tom's plans to move into a spare room above the workshop, fearing that his electricity needs will drain power from one of her experiments.
Tom and Annie try to turn the tables on some furniture-stealing robbers.
Tom tires of being known as a "science nerd," so he tries out for a hockey team rather than entering the "Brain Olympics."
Tom and Annie help their friend Millie redecorate her apartment in preparation for her daughter's visit.
Part 1 of 3. A visiting rock star's one-of-a-kind guitar is stolen and later offered for ransom.
Part 2 of 3. Tom's friend Lance gets an unusually high-paying job, leading Annie to question the integrity of Lance's employers.
Conclusion. Tom and Annie investigate the mysterious disappearance of their tenant, Mr. Bell.
Tom tries to prove that his friend, the school basketball star, is not deliberately throwing games.
The Edisons get involved in a feud between a hydrologist and a "water witch."
Paul meets a man who claims that his yard is being taken over by "mole people."
When Annie and her friend get trapped in a cave, Tom plans a rescue.
Lance gets his big break in showbiz when the leading man in a local production of "Romeo and Juliet" gets injured.
Tom and Annie's research on physical endurance levels is put to the test when Paul takes a long walk during a heat wave.
The Edisons become friendly with a famous balloonist and his daughter who are in town to raise money for their next expedition.
Computer chips start disappearing from a research company, prompting Annie to try to uncover flaws in the security system.
Annie helps Paul with his school project on ostriches.
The twins lure their parents into a fishing competition that pits the male members of the family against the females.
Annie, Paul and Lance participate in a wilderness race that takes them across river gorges and down the sides of cliffs.
Annie is determined to finish the wilderness race despite the ransacking of her campsite.
Conclusion. The person who pretended to be the "Windigo monster" mysteriously disappears after agreeing to turn himself in.
The twins use scientific techniques to help a history teacher look for "pirate treasure" that's supposedly hidden on his property.
Tom and Annie gear up for a big go-cart race by creating a scientifically enhanced vehicle for their friend Howie.
Tom's new career as a photographer may be having a negative effect on Annie's science project---and his relationship with his girlfriend.
Tom and Annie's black-tie party is jeopardized when Paul sets a tarantula loose.
Paul and his friend discover a baby elephant and decide to keep it as a pet.
Part 2 of three. The baby elephant that Paul discovered is on the loose again, but this time it's wearing a priceless jewel-covered harness.
Conclusion. The twins learn that the jewels in the elephant's harness are fakes and that the real gems are being smuggled out of the country.
Paul decides to focus on a career in filmmaking after an evening of video watching. Meanwhile, a family friend is in danger of being framed unless the twins discover the origins of a doctored videotape.
Tom decides to automate the entire Edison household, causing a massive electrical breakdown.
Tom and Annie cook up a plan to catch a poltergeist that's turning a pizzeria upside down.
After watching George Kelsy's video will, the twins take part in a treasure hunt in Kelsy's old mansion.
Lance gets Tom, Annie & Paul to participate in a bowling tournament & are known as the Weston Strikers! In each team, there's a pro or league bowler, two amateurs & a junior member. Four teams participate & The Weston Strikers along with the Roll & Bowl Bombers make it to the finals, two games; one on each home alley. In the deciding game, Lance's game has gone bad & thinks that his missing lucky locket is causing his losing streak. Then Annie notices that the bowling balls are all greased up. So she goes to Lance's car to get some sunglasses. She shows Tom & Lance that their lane is all oiled up causing a strike to be impossible to make. The four told the rival owner what he did & then asked the referee to change lanes (from lane 12 to lane 13). The Weston Strikers make a comeback to win the tournament (when Paul converts the 7-10 split). They donate the prize money to the owner of Lance's favorite bowling alley so he could remodel the place.
Lance's concert-going hits a sour note when he's almost arrested for using counterfeit tickets.
Upon moving into their university residence, the twins discover a mysterious letter that hints of an unsolved murder.
Life at Bayfield University proves to be a real education as Tom undergoes a fraternity initiation and Annie's lab partner protests the use of animals in scientific research.
When Bayfield's star quarterback is accused of taking drugs, the twins make it their goal to clear his name.
The twins branch out into school politics when they support an environmental advocate's efforts to be elected to student government.
Annie's enthusiasm grows when Tom digs up a way to make her botany project germinate more effectively.
Paul learns a lesson about the power of persuasion when he's taken in by Annie's charismatic new tutor.
The stakes are high when the twins get involved in a treasure hunt while horseback riding.
Annie pointedly disapproves of Tom's involvement in a pyramid money-making scheme.
Tom and Annie conduct their own investigation to prove that the police have arrested the wrong man for a recent crime.
Tom is haunted by the possibility that he saw a ghost in an abandoned house, until Annie prompts him to conduct a scientific investigation.
The twins try to track down a hacker who's determined to crash the university's computer system.
A seemingly friendly travel agent forces Tom to take an unexpected trip into the world of international intrigue.
Lance's announcement that he's tying the knot has the twins at the end of their rope when they are put in charge of pulling the affair together.
