Tink is desperate to get his name into the Gumbledex, a record of outstanding Gumble achievements, and so sets out to break a record.
Happi has finally finished building his Gumbly Horn and wants to put on a performance, but then Bounce breaks the spring that powers the horn.
Merri and Jolli leave the Gumbletree after overhearing Tink insulting their singing, but when WeatherSnike hears them, she is dazzled.
When the ball from their game of pock-pock ends up in the hands of the Bottersnikes, Tink, Bounce and Willi try to retrieve it.
Tink finds a Bottersnike disguise in the junkyard and puts it on to scare his friends, but then he is mistaken for a real Snike by Snorg and Glob.
Bounce is determined to conquer all the highest summits in the junkyard, but when she tries to scale one in Snike Hill she climbs so high that she freezes, loses her stretch and risks capture by the Snikes.
Grubloom Day is the one day of the year when a rare flower blooms and delivers up delicious grubs for the Gumbles, but when Bounce eats Willi's share, she is determined to make it right, and sets off to Snike Hill to find another Grubloom.
All the Gumbles are competing in the Gumble Rally, a fast-paced race through the junkyard, but they run into the Bottersnikes who have set up camp in the middle of the course, leaving Merri and Jolli to overcome their bickering to work together and rescue their friends.
When a nasty case of the Snike flu spreads through the Gumbletree, Toot is forced to overcome his greatest fear and venture back to Snike Hill to retrieve the only known cure for the flu - mattress stuffing.
Tink steals the Bottersnike's giant magnet, but instead of destroying it as planned, Tink, Bounce and Willi decide to use it to barricade the Snikes into Snike Hill.
Tink mistakes the sun reflecting off a discarded toilet seat as a special weapon.
Willi stumbles upon a baby Snike conjured up from one of Smiggles dreams.
Tink tries to trick the Snikes into thinking there is a Snike-eating Gumble on the loose.
Tink must work with his nemesis Glob in order to return to safety.
When the Snike King launches an attack on the Gumbletree, Tink manages to shrink him in the water and take him as their prisoner.
After twice mistakenly claiming to have seen a monster, Willi is reluctant to be made a fool of again and doesn't alert anyone when he spots something suspicious under the Gumbletree. But when the Snikes kidnap his friends, it's up to Willi to save them.
When Tink, Bounce and Willi find themselves trapped on Snike Hill with no memory of their capture, they try to recall what happened, but Tink and Bounce have very different versions of events, each placing the other at fault.
When the Bottersnikes discover they need smaller hands to reach some sofa rot in their mattress mine, they use Gubbo's new Gumble-grabber to snatch the Gumbles from the Gumbletree to do it for them, leaving Float to mount a solo rescue.
After learning of Happi's failed experiment to send a Gumble into space, Tink becomes determined to try it, but when he is detached from his safety rope, Happi must launch himself into space to save Tink.
Float is growing increasingly annoyed by Merri and Jolli distracting her search for the mythical three-headed dump dragon, but when she tells them to go and play in the storm, and they end up captured in Snike Hill, Float feels responsible and mounts an ingenious rescue mission.
After getting a grater stuck on his head, Willi is mistaken by the other gumbles for the legendary, snike-slaying Captain Grate Face, and finally starts getting the respect he deserves, but when the snikes show up, Willi must either come clean or live up to his newly acquired heroic reputation.
After Tink recklessly stinks out the Gumbletree, he tries to behave more responsibly as he leads the gumbles on a snike lookout, but when he takes his responsible attitude too far, he gets Merri and Jolli captured by snikes and must revert to his old, impulsive habits to save the day.
Happi is teaching gumblecraft to try to instill its virtues into the other gumbles, but when the snikes destroy the dodge gumble pitch during the class, the gumbles blame Happi, who sets out to prove the worth of gumblecraft by using it to trap the snikes.
When a blue moon causes blue grubs to spring from the ground, Happi warns the other gumbles about the dangers of eating them, but Merri accidentally eats one, and turns into a fierce weregumble, charging into Snike Hill looking for prey.
When Tink is assigned lookout duty while the other gumbles pick berries, he builds a dummy to cover for him, but when his failure to keep a lookout allows the snikes to approach, they mistake the dummy for a real gumble and take it to the King, leading the other gumbles to launch a rescue mission for what they think is Tink!
When the Gumbles grow tired of Tink's bossy behaviour and refuse to help him, he invents a robot to replace them, but when his stubbornness gets his friends captured and his robot stolen, he concedes that he needs his friends' help after all.
When Tink completely forgets Bounce's gumbleday, he lies and pretends he has a great present waiting for her in the junkyard, but when he leads her straight into a snike attack, he is forced to admit the truth.
When Toot accidentally swallows a kazoo, the sound of his voice summons giant grubs that enjoy sucking on gumbles, and it's up to Toot to find a way to free his friends and rid the junkyard of the grubs.
When Weathersnike captures Tink, Bounce and some grubs to make a tonic to cure the king's hiccups, the gumbles and grubs must call a truce and work together to escape Snike Hill.
When an over-inflated and spanged Float gets stuck above Snike Hill, she accidentally gets Tink, Bounce and Willi captured, and must pretend to be a giant raincloud that Weathersnike predicted, and scare the snikes into hiding so she can save her friends.
Jolli finds a Polaroid camera and takes some snaps of Merri posing with a sleeping Snike. But when Jolli gets jealous that Merri gets all the praise for the photos, she convinces him to take some photos of her - but ends up causing him to be captured by the Snikes.
After listening to Tink, Bounce and Happi showing off about the things they've stolen from Snikes, Willi decides to get something of his own. But when he is caught by the king and used as a hairpiece, Tink herself has to pose as a hairpiece for Chank in order to rescue him.
Indecisive Willi finds a talking doll that provides answers to questions and begins using it to help him make decisions. But when it suggests he try to make allies out of the Bottersnikes, he is captured and must learn to think for himself.
When Tink and Bounce become fused together, they soon grow sick of each other. But when the King Snike captures them as his servants, they must overcome their disagreements and cooperate in order to escape.
After Happi finds chili-grubs hiding in the chili-weeds around the Gumbletree, Tink dares Willi and Bounce to join him in eating them all. But when they make the Gumbles smell so bad that it begins to attract Snikes, Willi is captured and it's up to Tink and Bounce to use their stench to save him.
Tink is delighted when Happi drinks too much youngenberry juice, causing him to stop being his usual worrisome self and instead embark on risky gumbling shenanigans. But when Happi begins to get out of control, the other Gumbles must return him back to normal before he puts them all in danger.
Merri and Jolli are having a great time playing pranks on (or grubbing) the other Gumbles, but when they push it too far and try to prank the Snikes, they are captured. It's up to Happi, who wrote the book on grubbing, to rescue them with the ultimate prank.
Whilst being held captive by the Bottersnikes, Tink overhears how much the king fears rain. He decides to pretend he has weather prediction powers and predicts a storm in order to trick the Snikes into hiding, leaving the Gumbles to play in peace.
When Willi, tired of not being taken seriously, discovers that a heroic Gumble captured years earlier may still be being held under Snike Hill, he launches an ill-fated solo rescue mission.
After being captured by the Snikes and put in the mattress mine, Tink, Bounce and Willi bicker about whose escape plan is the best. Above them, the Bottersnikes hold a pageant to crown the ugliest Snike on Snike Hill.
Bounce is taken captive by a colony of grubs, and soon finds that she enjoys their company, but after Tink trades the gumbles grub supply for Bounce's safe return, she has warmed to the grubs so much that she begins behaving like one, landing herself and her friends in trouble on Snike Hill.
When Tink accidentally gets the twins tangle-spanged, he sets off to find grubs to cure them, unaware that Gubbo has invented a machine to round up all the grubs in order to starve the gumbles out of existence.
When the gumbles are attacked by one of Smiggles' dream creatures, Merri and Jolli wake Smiggles up, getting captured in the process, so Tink decides to impersonate a Smiggles dream creature in order to save his friends.
When Sammi Whammi Gumble returns from space, he tries to hide the fact that he is out of shape to try and impress the other gumbles, but when his charade gets Happi captured, he is forced to come clean to Tink in order to save him.
When Happi teaches Merri and Jolli the ancient art of gum fu, he fails to mention that it is useless when it comes to fighting actual snikes, and when the twins set off to Snike Hill to pick a fight, it is up to the other gumbles to save them.
When the twins turn out to be poor captains on the junkboat they've built, the other gumbles mutiny and put Toot in charge, but when the twins are captured by the Snike's enemy ship, the gumbles must mount a swashbuckling rescue mission.
When Willi causes the furnace fire to go out, leaving the gumbles freezing cold, he lures Smiggles to the gumbletree to try to enrage him enough to use his burning ears to relight the furnace.
When his Bottersnike costume fails to beat Tink's at the fancy dress party, Willi ventures to Snike Hill to prove how convincing his outfit is, but ends up stuck in the King's ear, where he poses as his conscience and begins instructing him on what to do.
When the gumbles are struck with boggle twitches, Float is charged with gathering nettles to cure them, but soon finds herself lured in by Weather Snike to cook up a batch for the ailing snikes.
When the scorching junkyard heat dries up the moat around the gumbletree, the gumbles rely on Tink to come up with a plan to keep them safe from a snike attack, despite the fact that the heat has given Tink tinkblock.
Jolli is sick of all her achievements being shared with Merri, so sets out to prove herself as a solo gumbler, but when she ditches her brother and he is captured by the snikes, she launches a rescue mission and realises she is much better when she works with her other half.
In spite of her larger size, Bounce is determined to win a game of Better Out Than In, but ends up getting herself stuck in a tin and causing Tink and Willi to be captured, so decides to use her size to her advantage and rescue them.