The Octonauts and the Frown Fish Other Books in This Series

The Octonauts and the Great Ghost Reef The Octonauts and the Great Ghost Reef
The Octonauts and the Great Ghost Reef
2009
The Octonauts and the Sea of Shade The Octonauts and the Sea of Shade
The Octonauts and the Sea of Shade
2007
The Octonauts and the Only Lonely Monster The Octonauts and the Only Lonely Monster
The Octonauts and the Only Lonely Monster
2014