When Meeks learns that Dom is heading to the moon on his rocket ship for one, he worries that Dom might never come back - so he tries ways and means to prevent him from setting off on his adventure.
When a floating garbage patch endangers a flock of pelicans and other sea creatures, the Octonauts and the birds work together to clean it up.
Dom has built a huge sandbox for everyone to play in, but Sparky doesn't want to partake in the fun because she'll get dirty. However, she has a change of heart after waking up from a bizarre dream.
The Octonauts venture into a dangerous red-hot lava tube to rescue a teeny tiny water bear.
When Dom and Sparky discover that Sparky has baked an enormous teddy treat, they go out of their way to please her in the hopes of getting it.
Kwazii and Dashi become entangled in a strange deep-sea creature - a siphonophore - and when a geyser blasts it toward the surface, the Octonauts must stop its ascent before it fatally bursts.
When a gust of wind takes Sparky's apple pie recipe out the door, she quickly chases after it. As it flies through the garden, her friends chip in to help retrieve it.
Kelp-eating red sea urchins attack a kelp forest. The Octonauts are helped by Shellington's sister, Pearl, another sea otter and scientist.
An enormous lion's mane jellyfish gets its amazingly long tentacles tangled in the Octopod's engine whilst Tweak is working on it.
When Peso's patient, a remora fish, mysteriously disappears, the Octonauts enlist a unique undersea detective - a harbour seal.
The Octonauts attempt to keep the peace amongst a trio of mudskippers whose home has been flooded.
The teddies are having a great time playing hide-and-seek dressed as jungle animals. However, things start to get a little tricky when all of them want to dress up as lions and be 'it'.
While rescuing river creatures after a storm, the Octonauts find a strange egg.
After spotting a bright red bug, Meeks and Tizzy are eager to look for it in their big bug book - but they can't seem to find the book. Sparky suggests sorting out all their books and setting up a library.
Mistaking a paint spill on the canvas for Meeks' unfinished painting, his friends take turns to add to it - unwittingly transforming it from a painting of a sun to a ladybird to a sunflower.
Shellington and the Vegimals are on a mission to replant a mangrove forest.
It's a very, very, very cold day and the teddies are freezing. Dom tries to warm up the house with his new 'Heaterer Upperer' invention, but things don't go as planned.
When a sardine swallows the key to a treasure chest, a humpback whale helps Kwazii track it down.
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