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After a Blowflyman fan convention, the others mock Holden’s insistence that Blowflyman is a real superhero with real powers. He sets out trying to prove it by putting himself in ‘peril’, from which Blowflyman has to save him.
Holden turns the Thongs' home into a remote-controlled smart house. But now the house is too smart and tries to eliminate the Thongs. When it sprouts legs, Holden must shut it down before it leaves town.
Narelle’s attempt to be the first girl to pedal-boat to Switzerland is thwarted when, delirious with the heat, she mistakes Whale Bay for the Swiss Alps. Not to be outdone, Holden tries to walk around the world on giant inflatable thongs.
Holden unearths a Diprotodon skeleton while digging a backyard pool and decides to clone some Aussie megafauna from the bones. He takes some shortcuts and a prehistoric wombat is wrecking Whale Bay in no time.
After Holden builds the most powerful radio in the universe, Narelle accidentally invites a family of Thong-eating aliens from the planet Kevin to lunch, and the Thongs end up as the meat on the world’s biggest BBQ.
When Narelle decides to become Australia's first female astronaut, the Thongs start the Whale Bay Space Program and Holden accidentally launches the house - and the whole Thong family - on a collision course with the Moon.
Trevor, Holden and Rerp decide to dig a cross-town tunnel but end up trapped in a cave with a giant angry glow-worm. When Brenda lands in the cave as well, it's up to Narelle to save them, but she's busy barbecuing for Kevin.
Holden catches a bigfooted Yowie who's searching for his missing thong and thinks the Giant Thong is rightfully his. The Thongs have to hide their beloved tourist attraction and find a solution to Howie's sore foot problem.
When the beach mysteriously vanishes, Holden opens a wormhole between Whale Bay and The Great Sandy Desert to replace the sand. When he's unable to close the wormhole, the Thongs end up with more beach than they can handle.
After he eats a radioactive cockroach, Holden develops cockroach super powers and Rerp tries to eat him. When Trevor builds the Leaning Thong of Whale Bay, Rerp uses it to capture the creepy-crawly superhero Cockroach Boy.
Plans to stage 'The Running of the Bulls' are dashed when Trevor mistakenly orders a mechanical rodeo bull. Holden adds legs and builds more metal moo-ers but they go crazy and everyone has to run for their lives.
To compete with a rival tour boat, the Thongs add a venomous snake display to their whale-watching tour. On-board havoc ensues when Holden's high-pitched whale-attractor shatters the tank and all the deadly snakes escape.
Holden builds a rail system to avoid having to walk to school, but halfway through its maiden voyage he remembers he forgot to build stops. When the brakes don't work, the train just gets faster and no one can get off!
When Holden promises some tourists a whale sighting experience, he searches all over without luck only to find a talking whale 'beached' in the lounge room!
The Thongs test drive Holden's latest invention, a machine that creates dreams. The machine malfunctions and they all end up in Rerp's dream, dodging jumbo blowflies and becoming enslaved to King Rerpses III.
When Holden makes a koala angry, it bites Brenda and Kevin and they both turn 'part koala'! Soon most people in town are koala-were-bears, and Narelle and Holden have to smash a cursed crystal to turn them back into humans.
Holden builds a 'dolphin attractor' so he can swim with dolphins. Instead he attracts sharks. When he tries to train them using Brenda's donuts, they end up able to survive on land, becoming consumers of art... and artists.
When Holden finds an abandoned nuclear sub, Narelle sees her chance to flee Whale Bay, once she's cured Kevin's claustrophobia. The others take the sub for a spin, but end up stuck on the sea floor, menaced by a giant squid!
After a nightmare, Holden sets up a metal detector to prove the Weedy kid is actually a terminator robot. When he 'fine-tunes' it, he inadvertently creates a cloning machine and thousands of Weedies lay siege to their house.
Using an alien shrinking-and-enlarging device that falls from the sky, Holden enlarges a seashell to be the Whale Bay Opera House. He forgets to check it's empty and an enlarged, enraged crustacean creates operatic havoc.
Holden builds a nuclear-powered air-conditioner to combat Whale Bay's hottest day ever. When he's unable to turn it off and they can't get out of the house, the Thongs face freezing then thawing out.
Holden invents a robotic footy boot and gets the Thongs into trouble when he kicks a ball halfway around the world and it hits a military dictator, who declares war but settles for a winner-takes-all penalty shoot-out.
Holden makes the world's loudest band even louder for a festival at Whale Bay. The music's vibrations rupture the Earth's crust and both the Thongs' house and the stage break away from Whale Bay.
When Narelle is dateless for a Valentine's Day Ball, Holden uses a modified photocopier to transform Rerp into a handsome prince. Narelle and Prince Rerpert are the hit of the ball until an angry polka-playing ghost turns up.
Holden accidentally develops an interest in astronomy and turns the Giant Thong into a super-strong electro-magnet to change the course of Davo's Asteroid, but now the flamin' space-boulder is set to wipe out Whale Bay!
When the Thongs stage a floating welcome Aussie BBQ for the Queen, she mistakes them for pirates.
