Sarah, 12, lives on a boat with her parents, who research whale sharks. Her only friend is a whale shark named Jack, who Sarah rescued when he was a pup. But following a tragic accident, mum and Sarah move to the coastal town of Exmouth. Desperate to return to her old life, Sarah pegs all her hopes on Jack, certain that when his migration brings him back to Exmouth, mum will take her out on the boat again. But Jack fails to return, so Sarah embarks on a risky mission to find him.
| Actor | Role |
|---|---|
 Alyla BrowneSarah | Sarah |
 Abbie CornishNita | Nita |
 Rachel WardAunty Dot | Aunty Dot |
 Ursula YovichHazel | Hazel |
 Michael DormanMarcus | Marcus |
| GGiselle PhilogeneAshleigh | Ashleigh |
| EEmmi WilliamsYoung Sarah | Young Sarah |
| LLuca MillerEJ | EJ |
| JJayden BoundryPeter | Peter |
 Therese MavrosReceptionist | Receptionist |
 Karen O'LearyNot listed | Not listed |
| SSienna CateNot listed | Not listed |
| KKhrob EdmondsNot listed | Not listed |
| MMillie-Rose RonanNot listed | Not listed |
 Riley StilesNot listed | Not listed |
| TTate TolchardNot listed | Not listed |