Save the Mermaid Kingdom

 is the fifteenth episode of "The Backyardigans 2.0" written by Hornean.

''Captain Andrew and his crew journey in the undersea vehicle to study the underwater activities. But soon they heard a call for help from three mermaid sisters (Uniqua, Ramona, and Penny). They took them to the Mermaid Kingdom where King Austin tells them that a series of quakes is threatening the kingdom. Can Andrew and his crew find out what's causing the shaking?''


 * Andrew (Captain Andrew)
 * Jason (Lieutenant Jason)
 * Martin (Medic Martin)
 * Thomas (Ensign Thomas)
 * Pablo (Scientist Pablo)
 * Tasha (Photographer Tasha)
 * Henwen (Engineer Henwen)
 * Sophie (Gardener Sophie)
 * Victor (Chef Victor)
 * Kathy (Chef Kathy)
 * Moe (Professor Moe)
 * Austin (King Austin)
 * Jordan (Queen Jordan)
 * Uniqua (Mermaid Uniqua)
 * Ramona (Mermaid Ramona)
 * Penny (Mermaid Penny)
 * Tyrone (Vizier Tyrone)
 * Kevin (Merwizard Kevin)
 * Tina (Merwitch Tina)
 * Sparky


 * "Swimming, Swimming"