The Octonauts and the Poisonous Mermaid Spell is the 24th episode of Season 4.
Kwazii is cursed by a Poisonous Mermaid while collecting pearls and rubies in her lair he thought was an ordinary cave for his sister and falls into a deep sleep. So Peso and Barnacles go into the Midnight Zone to find the rarest kelp, the Black Kelp, to cure Kwazii before he sleeps forever.
The episode begins in
- Jake is the first character to use Kwazii's bracelet.
Captain Barnacles (Narrating): The Octonauts and the Poisonous Mermaid Spell.