The Octopod is grabbed by a colossal squid. The Octonauts are unable to break free due to the hooks on the ends of the squid's tentacles. Fortunately the arrival of some sperm whales turns the squid from hunter to hunted.

　　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.

　　A dangerous tidal wave washes all the fish up in the trees, which is also a big problem for the poison dart frogs who don't have enough puddles up in the trees for the tadpoles. Luckily, Tweak's new Gup-H is ready to help.

　　2015年10月21日，英国银色之门媒体公司宣布将与中国中央电视台联合开发全球知名儿童海洋探险动画《海底小纵队》第五季。签字仪式于当天下午在英国文化部举行。中国中央电视台副总编辑李挺作为代表与英国银色之门媒体公司副主席威廉·阿斯特签署了动画片《海底小纵队》第五季联合制作谅解备忘录。英国文化、媒体和体育部政务大臣艾德·韦泽主持并见证了签约仪式。这是中央电视台首次与西方动画公司合作开发一部学龄前儿童作品，银色之门媒体公司将提供动画剧本和音乐创作，制作部分则由中央电视台全权负责。　　目前已制作出第六季，将在腾讯少儿首页首播。