Season 4 - Episode Guide

Episode: 4x01 | Airdate: Sep 23, 2015 (11 min)

Episode: 4x02 | Airdate: Sep 24, 2015 (11 min)

Episode: 4x03 | Airdate: Sep 25, 2015 (11 min)

Episode: 4x04 | Airdate: Sep 28, 2015 (11 min)

Episode: 4x05 | Airdate: Sep 29, 2015 (11 min)

Episode: 4x06 | Airdate: Sep 30, 2015 (11 min)

Episode: 4x07 | Airdate: Oct 1, 2015 (11 min)

Episode: 4x08 | Airdate: Oct 2, 2015 (11 min)

Episode: 4x09 | Airdate: Dec 14, 2015 (11 min)

Episode: 4x10 | Airdate: Dec 16, 2015 (11 min)

Episode: 4x11 | Airdate: Mar 14, 2016 (11 min)

Episode: 4x12 | Airdate: Mar 14, 2016 (11 min)

Episode: 4x13 | Airdate: Mar 22, 2016 (11 min)

Episode: 4x14 | Airdate: Mar 22, 2016 (11 min)

Episode: 4x15 | Airdate: Mar 28, 2016 (11 min)

Episode: 4x16 | Airdate: May 29, 2017 (10 min)

The Octonauts, for more deep sea adventures. While exploring a dark and spooky cave, the Octonauts discover the fossil of a powerful, prehistoric fish... but it may be more than just a fossil.

Episode: 4x18 | Airdate: Sep 20, 2017 (11 min)

Returning home from a mission along an African river, the Octonauts encounter a gang of large, territorial hippos.

Episode: 4x19 | Airdate: Sep 27, 2017 (11 min)

After Shellington crashes the Gup-D, he and Kwazii team up with a moray eel and grouper fish to pick up the pieces.

Episode: 4x20 | Airdate: Oct 23, 2017 (11 min)

While diving down to the Midnight Zone, the Octonauts are attacked by bomber worms and are enlisted to rescue an injured member of their troop.

Episode: 4x21 | Airdate: Oct 24, 2017 (11 min)

Dashi teams up with her little sister Koshi to solve a mysterious disappearance in a kelp forest.

Episode: 4x22 | Airdate: Oct 25, 2017 (11 min)

Kwazii and the Octonauts help their friends the coconut crabs discover who is stealing their coconuts.

Episode: 4x23 | Airdate: Oct 26, 2017 (11 min)

Kwazii adopts a baby alligator, but when it escapes from the Octopod he must rescue the tiny creature from ocean currents and hungry predators.

Episode: 4x24 | Airdate: Oct 27, 2017 (11 min)

The Octonauts struggle to save a pod of spinner dolphins who seem to be swimming in their sleep.

Episode: S04 Special | Airdate: Dec 3, 2016 (25 min)

Special episode of the animated deep sea adventure series. Join Captain Barnacles and his intrepid band of explorers, The Octonauts, for more deep sea adventures. The Octonauts roam the oceans in search of adventure and fun. Whether it's a perilous voyage to the bottom of the sea or the piratey pursuit of a giant squid, the Octonauts leap into action and always prove that eight heads are better than one.