28 September 2006
When Zane causes the enigmatic Miss Chatham to be evicted from her boat, Emma invites her to stay at her home. Overhearing her concern for her "treasure", Zane chases after Miss Chatham seeking compensation for his damaged jet ski when she departs the marina in her boat. Zane attacks Miss Chatham and she passes out. Emma and Lewis arrive in time to help with a medical emergency but when Zane gets trapped on the sinking boat, Emma must risk being seen as a mermaid to save him. Emma uses her tail to break open the boat's door, and Zane sees her tail. After he passes out, Emma takes him to Mako Island, where he wakes up and makes a vow to find out what it was that saved him. Emma shows Miss Chatham her treasure, which is a locket. Miss Chatham moves to a retirement home.
- International Airdates:
- Denmark: March 8, 2008 on Jetix
- Poland: September 23, 2007 on Jetix
- This episode aired in the US on May 25, 2008.
- Last episode directed by Colin Budds.
- Emma appears to drink from the glass that Mrs. Chatham gave her, but she doesn't actually drink anything.
- The Sea Monster storyline is continued on for the rest of the series.
- The scratch on Zane's jet ski that he says was from Mrs. Chatham's boat is facing the port.
- The picture of the girls were wearing the same outfits they wore in Dangerous Waters. It was possibly after the events.
- The original mermaids are seen for the first time in a photo.
- Lewis: (about Miss Chatham) Some people say she's a witch.
- Rikki: And if they said she was an Easter Bunny would you believe that?
- Lewis: There was a time I didn't believe in mermaids either.
- Miss Chatham: They're just after my treasure!
- Zane: You are a disgrace to this port! You left a scratch on my boat!
- Rikki Chadwick - Cariba Heine
- Emma Gilbert - Claire Holt
- Cleo Sertori - Phoebe Tonkin
- Lewis McCartney - Angus McLaren
- Zane Bennett - Burgess Abernethy
- Nate - Jamie Timony
- Elliot Gilbert - Trent Sullivan
- Neil Gilbert - Jared Robinsen
- Lisa Gilbert - Caroline Kennison
- Wilfred - Ariu Lang Sio
- Louise Chatham - Christine Amor
- Hendrix - Steven Tandy