Australian girl Kirra Grisby, Bindi Irwin, is sent to stay with her grandfather Gus Grisby, Beau Bridges, at his run-down Cape Town amusement park after her father is hospitalized. Upon arrival, she is met at the airport by Mansa, Bongo Mbutuma, one of Gus's longtime employees, and she befriends a Xhosa boy named Sifiso, Siyabulela Ramba.
A fierce storm reconfigures the coast, and a male orca calf becomes separated from his pod, winding up stranded in a lagoon on Gus's property. Kirra discovers the creature and names him Willy, instantly turning him into the park's newest and most talked-about attraction. Willy’s growing popularity ushers in a wave of attention from visitors and media alike, changing the park’s fortunes in surprising ways. Willy becomes a literal crowd-pleaser, and Kirra’s bond with the young whale deepens as they share the lagoon and the spotlight.
Gus’s fiercest competitor, Rolf Woods, Stephen Jennings, catches wind of Willy and offers to buy the animal for a staggering $500,000, though the deal never goes through. Kirra pushes Gus to seek professional help from marine rescue to rehabilitate Willy, but the whale’s under-developed echolocation makes a traditional release nearly impossible because he would be unable to survive away from his pod. Undeterred, Kirra begins researching ways to teach Willy to echolocate, despite being told there is no proven method to do so. The pair’s determination sets the stage for a daring experiment that could redefine Willy’s fate.
Kirra camps out by the lagoon, and Willy pulls her into the water, letting her ride him. Their unlikely partnership turns into a remarkable duo that attracts reporters and cameramen, turning the park into a media magnet. The money generated by their performances goes toward the fish Willy needs for echolocation training, and the act helps to sustain his growth and learning. But as Willy’s skill improves, Gus faces mounting pressure from the looming sale and the financial realities of keeping a growing whale in a seaside park. He eventually agrees to the deal with Rolf, but he insists the exchange take place after Kirra has already departed.
One day, Sifiso invites Kirra to visit his Uncle Rudy’s safari park. On their way back, they spot a billboard announcing Willy as a new attraction at Rolf’s theme park, confirming that Gus has already signed the agreement. Heartbroken, Kirra pleads with Gus to ensure that Willy will be treated well under Rolf’s care, and she hopes for a rescue that will keep Willy connected to his pod. When Kirra returns to the lagoon, she finds Willy’s pod nearby, but Gus dismisses her warning, doubting that Willy’s family remains close.
Kirra and Sifiso enlist Uncle Rudy’s help, but Rudy is hard to reach and ultimately not easily found. In the meantime, the two take drastic steps: they steal a crane truck and drive back toward Pirate’s Cove with Willy in tow. Gus agrees to help them return Willy to the ocean if his pod can be located, and the trio devises a plan that pits ingenuity against bureaucracy. Kirra and Sifiso head for the harbor with Willy, while Gus and Mansa work to distract Rolf with a makeshift Willy—constructed from a porpoise model found in the mini golf course.
The plan culminates as Willy is finally reunited with his pod, and the dramatic mission comes to a hopeful close. Kirra says goodbye to Mansa and Sifiso before boarding the plane back to Australia, promising to return next summer. In the end, Willy and his pod disappear into the ocean depths, leaving the park to reflect on the summer’s extraordinary events and the enduring bond between a girl, a whale, and a community that nearly rewrote their lives.
