|Air Date||September 27, 2003|
|Previous episode:||Next episode:|
|Moonlight Boy||The Heart That Believes|
Karen's Song is the twenty sixth episode of Mermaid Melody Pichi Pichi Pitch.
Lucia, Hanon, and Rina join Kaito in his trip to a surfing contest. Meanwhile, the Dark Lovers attack the trio, but a new purple mermaid saves the trio.
- This is the first time we hear Karen sing.
- This is the first time we see Karen transform.
- Karen is revealed as the fourth mermaid princess.
- Karen's idol form is revealed in this episode.