Octonauts S3E18
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S03E18 — The Urchin Invasion
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Octonauts

S03E18 The Urchin Invasion

2014-03-21

The Octonauts journey to the kelp forest to see Shellington's sister, Pearl, and her new baby, Periwinkle. However, they soon discover that the kelp forest is under threat from a swarm of urchins that are munching away at the kelp!

Season 3 Episodes

1
The Siphonophore
2013-09-04
 2
The Water Bears
2013-09-05
 3
The Cone Snail
2013-09-06
 4
The Artificial Reef
2013-09-09
 5
The Humpback Whales
2013-09-10
 6
The Pelicans
2013-09-11
 7
The Sea Pigs
2013-09-12
 8
The Yeti Crab
2013-09-13
 9
The Barracudas
2014-03-10
 10
The Duck-Billed Platypus
2014-03-11
 11
The Sea Skaters
2014-03-12
 12
The Mudskippers
2014-03-13
 13
The Harbour Seal
2014-03-14
 14
The Lion's Mane Jellyfish
2014-03-17
 15
The Red Rock Crabs
2014-03-18
 16
The Sea Sponge
2014-03-19
 17
The Immortal Jellyfish
2014-03-20
 18
The Urchin Invasion
2014-03-21
 19
The Hammerhead Sharks
2015-09-21
 20
The Loggerhead Sea Turtle
2015-09-22