My kids have been waiting and hoping for Octonauts stories - I think given the popularity of the cartoon on Netflix as well as the print books, it would be a lovely and popular card set. We have the hardcopy books which are fun, educational and beautifully illustrated and would love to see this as a Yoto set! The Underwater Adventure Box Set by Meomi contains these four stories:
The Octonauts & the Only Lonely Monster
The Octonauts & the Sea of Shade
The Octonauts & the Frown Fish
The Octonauts & the Great Ghost Reef
There are also two stand alone books which are equally excellent: The Octonauts Explore The Great Big Ocean and The Octonauts and the Growing Goldfish (both also Meomi).