Electra is having a brilliant time playing scary tricks on all her mermaid friends, and when Sparkle, the baby seahorse, joins in they have even more fun. But not everyone finds Electra's tricks very funny and when she tries to warn her friends about something truly dangerous, no one will listen to her.Electra is having a brilliant time playing scary tricks on all her mermaid friends, and when Sparkle, the baby seahorse, joins in they have even more fun. But not everyone finds Electra's tricks very funny and when she tries to warn her friends about something truly dangerous, no one will listen to her.