S03E19: The Hammerhead Sharks
The Octonauts meet some hammerheaded sharks, however, they can't sleep too well because Shellington and Professor Inkling have been arguing about who is smarter that they are no longer friends.
Previous Episode 
Season 1
The Undersea Storm
S1E1 / 05 Oct 2010
The Giant Squid
S1E2 / 11 Oct 2010
The Great Algae Escape
S1E3 / 13 Oct 2010
The Walrus Chief
S1E4 / 07 Oct 2010
The Flying Fish
S1E5 / 08 Oct 2010
The Narwhal
S1E6 / 26 Oct 2010
The Monster Map
S1E7 / 19 Oct 2010
The Crab and the Urchin
S1E8 / 06 Oct 2010
The Albino Humpback Whale
S1E9 / 21 Oct 2010
The Remipedes
S1E10 / 14 Oct 2010
The Orcas
S1E11 / 12 Oct 2010
The Blobfish Brothers
S1E12 / 18 Oct 2010
The Decorator Crab
S1E13 / 05 Nov 2010
The Whale Shark
S1E14 / 04 Oct 2010
The Cookiecutter Sharks
S1E15 / 13 Dec 2010
The Jellyfish Bloom
S1E16 / 16 Dec 2010
The Speedy Sailfish
S1E17 / 15 Oct 2010
The Vampire Squid
S1E18 / 08 Dec 2010
The Humuhumunukunukuapua'a
S1E19 / 10 Feb 2011
The Giant Spider Crab
S1E20 / 11 Feb 2011
The Giant Kelp Forest
S1E21 / 22 Oct 2010
The Hermit Crabs
S1E22 / 02 Nov 2010
The Hungry Pilot Fish
S1E23 / 07 Dec 2010
The Beluga Whales
S1E24 / 06 Dec 2010
The Snot Sea Cucumber
S1E25 / 29 Oct 2010
The Giant Whirlpool
S1E26 / 01 Nov 2010
The Slime Eels
S1E27 / 26 Jan 2011
The Arctic Orcas
S1E28 / 25 Jan 2011
The Lost Sea Star
S1E29 / 20 Oct 2010
The Giant Jelly
S1E30 / 10 Dec 2010
The Snapping Shrimp
S1E31 / 28 Oct 2010
The Kelp Forest Rescue
S1E32 / 04 Nov 2010
The Enormous Elephant Seal
S1E33 / 27 Jan 2011
The Sardine School
S1E34 / 28 Jan 2011
The Eel Ordeal
S1E35 / 01 Feb 2011
The Dolphin Reef Rescue
S1E36 / 31 Jan 2011
The Pirate Parrotfish
S1E37 / 04 Feb 2011
The Electric Torpedo Rays
S1E38 / 07 Feb 2011
The Midnight Zone
S1E39 / 27 Oct 2010
The Mixed-Up Whales
S1E40 / 03 Nov 2010
The Seahorse Tale
S1E41 / 09 Dec 2010
The Enemy Anemones
S1E42 / 25 Oct 2010
The Crafty Cuttlefish
S1E43 / 08 Feb 2011
The Lost Lemon Shark
S1E44 / 09 Feb 2011
The Baby Dolphin
S1E45 / 17 Dec 2010
The Scary Spookfish
S1E46 / 24 Jan 2011
The Oarfish
S1E47 / 14 Dec 2010
The Combtooth Blenny
S1E48 / 15 Dec 2010
The Marine Iguanas
S1E49 / 02 Feb 2011
The Dwarf Lantern Shark
S1E50 / 03 Feb 2011
Season 2
The Colossal Squid
S2E1 / 19 Nov 2012
The Adelie Penguins
S2E2 / 20 Nov 2012
The Coconut Crabs
S2E3 / 21 Nov 2012
The Great White Shark
S2E4 / 22 Nov 2012
The Sea Snakes
S2E5 / 23 Nov 2012
The Bowhead Whales
S2E6 / 26 Nov 2012
The Jawfish
S2E7 / 27 Nov 2012
The Porcupine Puffer
S2E8 / 28 Nov 2012
The Damselfish
S2E9 / 29 Nov 2012
The Scared Sperm Whale
S2E10 / 30 Nov 2012
The Long Armed Squid
S2E11 / 11 Mar 2013
The Fiddler Crabs
S2E12 / 12 Mar 2013
The Manta Rays
S2E13 / 13 Mar 2013
The Swashbuckling Swordfish
S2E14 / 14 Mar 2013
The Triggerfish
S2E15 / 15 Mar 2013
The Mimic Octopus
S2E16 / 13 May 2013
The Lionfish
S2E17 / 14 May 2013
The Leafy Sea Dragons
S2E18 / 15 May 2012
The Manatees
S2E19 / 16 May 2013
The Saltwater Crocodile
S2E20 / 17 May 2013
The Humphead Parrotfish
S2E21 / 02 Sep 2013
The Gulper Eels
S2E22 / 03 Sep 2013
Season 3
The Siphonophore
S3E1 / 04 Sep 2013
The Water Bears
S3E2 / 05 Sep 2013
The Cone Snail
S3E3 / 06 Sep 2013
The Artificial Reef
S3E4 / 09 Sep 2013
The Humpback Whales
S3E5 / 10 Sep 2013
The Pelicans
S3E6 / 11 Sep 2013
The Sea Pigs
S3E7 / 12 Sep 2013
The Yeti Crab
S3E8 / 13 Sep 2013
The Barracudas
S3E9 / 10 Mar 2014
The Duck-Billed Platypus
S3E10 / 11 Mar 2014
The Sea Skaters
S3E11 / 12 Mar 2014
The Mudskippers
S3E12 / 13 Mar 2014
The Harbour Seal
S3E13 / 14 Mar 2014
The Lion's Mane Jellyfish
S3E14 / 17 Mar 2014
The Red Rock Crabs
S3E15 / 18 Mar 2014
The Sea Sponge
S3E16 / 19 Mar 2014
The Immortal Jellyfish
S3E17 / 20 Mar 2014
The Urchin Invasion
S3E18 / 21 Mar 2014
The Hammerhead Sharks
S3E19 / 21 Sep 2015
The Loggerhead Sea Turtle
S3E20 / 22 Sep 2015
Season 4
Octonauts and the Poison Dart Frogs
S4E1 / 23 Sep 2015
Octonauts and the Hidden Lake
S4E2 / 24 Sep 2015
Octonauts and the Octopod Mystery
S4E3 / 25 Sep 2015
Octonauts and the Baby Sea Turtles
S4E4 / 28 Sep 2015
Octonauts and the Walrus Pups
S4E5 / 29 Sep 2015
Octonauts and the Mantis Shrimp
S4E6 / 30 Sep 2015
Octonauts and the Loneliest Whale
S4E7 / 01 Oct 2015
Octonauts and the Tree Lobsters
S4E8 / 02 Oct 2015
Octonauts and the Convict Fish
S4E9 / 14 Dec 2015
Octonauts and the Emperor Penguins
S4E10 / 16 Dec 2015
Octonauts and the Crawfish
S4E11 / 03 Dec 2016
Octonauts and the Flamingos
S4E12 / 04 Dec 2016
Octonauts and the Tiger Shark
S4E13 / 27 May 2017
Octonauts and the Sunfish
S4E14 / 28 May 2017
Octonauts and the Coelacanth
S4E15 / 29 May 2017
Octonauts and the Surfing Snails
S4E16 / 06 Sep 2017
Octonauts and the Yellow Bellied Sea Snakes
S4E17 / 13 Sep 2017
Octonauts and the Hippos
S4E18 / 20 Sep 2017
Octonauts and Operation Cooperation
S4E19 / 27 Sep 2017
Octonauts and the Bomber Worms
S4E20 / 23 Oct 2017
Octonauts and the Kelp Monster Mystery
S4E21 / 24 Oct 2017
Octonauts and the Coconut Crisis
S4E22 / 25 Oct 2017
Octonauts and the Baby Gator
S4E23 / 26 Oct 2017
Octonauts and the Spinner Dolphins
S4E24 / 27 Oct 2017
Season 5
Bluefin Tuna
S5E2 / 27 Mar 2023
Blue Whale Rescue
S5E3 / 28 Dec 2020
Season 6
Episode 1
S6E1 / 01 Jan 2021
Episode 2
S6E2 / 08 Jan 2021
Episode 3
S6E3 / 15 Jan 2021
Episode 4
S6E4 / 22 Jan 2021
Episode 5
S6E5 / 29 Jan 2021
Episode 6
S6E6 / 05 Feb 2021
Episode 7
S6E7 / 12 Feb 2021
Episode 8
S6E8 / 19 Feb 2021
Episode 9
S6E9 / 26 Feb 2021
Episode 10
S6E10 / 05 Mar 2021
Episode 11
S6E11 / 12 Mar 2021
Episode 12
S6E12 / 19 Mar 2021
Episode 13
S6E13 / 26 Mar 2021
Episode 14
S6E14 / 02 Apr 2021
Episode 15
S6E15 / 09 Apr 2021
Episode 16
S6E16 / 16 Apr 2021
Episode 17
S6E17 / 23 Apr 2021
Episode 18
S6E18 / 30 Apr 2021
Episode 19
S6E19 / 07 May 2021
Episode 20
S6E20 / 14 May 2021
Episode 21
S6E21 / 21 May 2021
Episode 22
S6E22 / 28 May 2021
Episode 23
S6E23 / 04 Jun 2021
Episode 24
S6E24 / 11 Jun 2021
Episode 25
S6E25 / 18 Jun 2021
Episode 26
S6E26 / 25 Jun 2021
Season 7
Episode 1
S7E1 / 01 Jun 2021
Episode 2
S7E2 / 08 Jun 2021
Episode 3
S7E3 / 15 Jun 2021
Episode 4
S7E4 / 22 Jun 2021
Episode 5
S7E5 / 29 Jun 2021
Episode 6
S7E6 / 06 Jul 2021
Episode 7
S7E7 / 13 Jul 2021
Episode 8
S7E8 / 20 Jul 2021
Episode 9
S7E9 / 27 Jul 2021
Episode 10
S7E10 / 03 Aug 2021
Episode 11
S7E11 / 10 Aug 2021
Episode 12
S7E12 / 17 Aug 2021
Episode 13
S7E13 / 24 Aug 2021
Episode 14
S7E14 / 31 Aug 2021
Episode 15
S7E15 / 07 Sep 2021
Episode 16
S7E16 / 14 Sep 2021
Episode 17
S7E17 / 21 Sep 2021
Episode 18
S7E18 / 28 Sep 2021
Episode 19
S7E19 / 05 Oct 2021
Episode 20
S7E20 / 12 Oct 2021
Episode 21
S7E21 / 19 Oct 2021
Episode 22
S7E22 / 26 Oct 2021
Episode 23
S7E23 / 02 Nov 2021
Episode 24
S7E24 / 09 Nov 2021
Episode 25
S7E25 / 16 Nov 2021
Episode 26
S7E26 / 23 Nov 2021
Season 8
Episode 1
S8E1 / 01 Jan 2023
Episode 2
S8E2 / 08 Jan 2023
Episode 3
S8E3 / 15 Jan 2023
Episode 4
S8E4 / 22 Jan 2023
Episode 5
S8E5 / 29 Jan 2023
Episode 6
S8E6 / 05 Feb 2023
Episode 7
S8E7 / 12 Feb 2023
Episode 8
S8E8 / 19 Feb 2023
Episode 9
S8E9 / 26 Feb 2023
Episode 10
S8E10 / 05 Mar 2023
Episode 11
S8E11 / 12 Mar 2023
Episode 12
S8E12 / 19 Mar 2023
Episode 13
S8E13 / 26 Mar 2023
Episode 14
S8E14 / 02 Apr 2023
Episode 15
S8E15 / 09 Apr 2023
Episode 16
S8E16 / 16 Apr 2023
Episode 17
S8E17 / 23 Apr 2023
Episode 18
S8E18 / 30 Apr 2023
Episode 19
S8E19 / 07 May 2023
Episode 20
S8E20 / 14 May 2023
Episode 21
S8E21 / 21 May 2023
Episode 22
S8E22 / 28 May 2023
Episode 23
S8E23 / 04 Jun 2023
Episode 24
S8E24 / 11 Jun 2023
Episode 25
S8E25 / 18 Jun 2023
Episode 26
S8E26 / 25 Jun 2023
Season 9
Episode 1
S9E1 / 01 Jan 2024
Episode 2
S9E2 / 08 Jan 2024
Episode 3
S9E3 / 15 Jan 2024
Episode 4
S9E4 / 22 Jan 2024
Episode 5
S9E5 / 29 Jan 2024
Episode 6
S9E6 / 05 Feb 2024
Episode 7
S9E7 / 12 Feb 2024
Episode 8
S9E8 / 19 Feb 2024
Episode 9
S9E9 / 26 Feb 2024
Episode 10
S9E10 / 04 Mar 2024
Episode 11
S9E11 / 11 Mar 2024
Episode 12
S9E12 / 18 Mar 2024
Episode 13
S9E13 / 25 Mar 2024
Episode 14
S9E14 / 01 Apr 2024
Episode 15
S9E15 / 08 Apr 2024
Episode 16
S9E16 / 15 Apr 2024
Episode 17
S9E17 / 22 Apr 2024
Episode 18
S9E18 / 29 Apr 2024
Episode 19
S9E19 / 06 May 2024
Episode 20
S9E20 / 13 May 2024
Episode 21
S9E21 / 20 May 2024
Episode 22
S9E22 / 27 May 2024
Episode 23
S9E23 / 03 Jun 2024
Episode 24
S9E24 / 10 Jun 2024
Episode 25
S9E25 / 17 Jun 2024
Episode 26
S9E26 / 24 Jun 2024
Season 10
Episode 1
S10E1 / 29 May 2025
Episode 2
S10E2 / 29 May 2025Episode 3
S10E3 / 05 Jun 2025Episode 4
S10E4 / 12 Jun 2025Episode 5
S10E5 / 19 Jun 2025Episode 6
S10E6 / 26 Jun 2025Episode 7
S10E7 / 03 Jul 2025Episode 8
S10E8 / 10 Jul 2025Episode 9
S10E9 / 17 Jul 2025Episode 10
S10E10 / 24 Jul 2025Episode 11
S10E11 / 31 Jul 2025Episode 12
S10E12 / 07 Aug 2025Episode 13
S10E13 / 14 Aug 2025Episode 14
S10E14 / 21 Aug 2025Episode 15
S10E15 / 28 Aug 2025Episode 16
S10E16 / 04 Sep 2025Episode 17
S10E17 / 11 Sep 2025Episode 18
S10E18 / 18 Sep 2025Episode 19
S10E19 / 25 Sep 2025Episode 20
S10E20 / 02 Oct 2025Episode 21
S10E21 / 09 Oct 2025Episode 22
S10E22 / 16 Oct 2025Episode 23
S10E23 / 23 Oct 2025Episode 24
S10E24 / 30 Oct 2025Episode 25
S10E25 / 06 Nov 2025Episode 26
S10E26 / 13 Nov 2025
Keith Wickham
Simon Greenall
Jo Wyatt
Teresa Gallagher
Dashi
