Determined to build "the biggest, fanciest, most excellent sandcastle" to impress her sister, Jules is foiled again and again by the ocean.

Follows the adventures of a stowaway boy, including his friendship with captain and crew and near shipwreck during a violent storm.

"Two lovable mismatched rovers are back for another adventure, this time on an oceanic planet! Organized, careful Rover and impulsive, excitable Speck are ready to set off on their next dangerous, hazardous, mysterious mission: a trip to Unexplored Planet K2-18b. Adventure is underway as they splash down onto the watery surface of this world and get to know the locals. Before long, the two rovers find themselves on a new mission: to help two Spikey-Spikes...