Billy and Sheena visit their Uncle Harold on an island in the Caribbean, but while exploring under water they find something terrible lurking deep below the sea.
| Actor | Role |
|---|---|
 Laura VandervoortSheena Deep | Sheena Deep |
 Tod FennellBilly Deep | Billy Deep |
 Maria VacratsisJanet | Janet |
 Paul MillerDr. Harold Deep | Dr. Harold Deep |
 Mark EllisJake Ritter | Jake Ritter |
| AAlex FallisFish Face #1 | Fish Face #1 |