Captain Barnacles is the brave, reliable polar bear who captains the Octonauts. Known for his exceptional leadership, incredible "polar bear strength," and signature blue captain’s hat, he guides his crew to explore, rescue, and protect marine life. He enjoys playing the accordion and charting maps.

Kwazii is a daredevil orange cat with a mysterious pirate past and the thrill-seeking Lieutenant of the Octonauts crew. Best known for his swashbuckling, racing the Gup-B, and his "yeow!" catchphrase, he balances an adventurous, rebellious spirit with a soft, caring heart

Peso Penguin is the compassionate and caring medical officer of the Octonauts. Though timid, shy, and easily spooked by Kwazii’s tall tales, he becomes incredibly brave when a sea creature is injured or sick. He always carries his medical kit and is a master of bandages.