Atem and his friends dove into the underwater adventure and turn themselves into se a creatures with Atem turn into a merboy and the Mane 5 become Sea-ponies (expect for Spyro and his family and his friends, Dax and his fellow Dragamonz, Talon and her friends and Blaze, Rocky and their friends can breathe underwater, cause dragons swin underwater)and meets Aaron an young teenage merman after he saves Princess Erika from drowning during the storm, he makes the deal with the powerful wicked, and vicious sea sorcerer, Ursulus makes a deal for Arron to trade his voice for a pair of human legs.
