It's been two years since Jesse saved and freed his Killer whale friend, Willy. Jesse, now a teenager, has since been adopted by his foster parents, Glen and Annie Greenwood. Jesse and his adoptive parents are preparing to go on a family camping trip to the Pacific Northwest. Glen has been trying to teach Jesse to drive their motorboat, but Jesse is more interested in girls. Before they leave town, however, Dwight, Jesse's former social worker, shows up to inform them that they have found Jesse's biological mother, who abandoned him 8 years ago. Jesse's mother has died and left behind another son, Jesse's half-brother named Elvis (Francis Capra). Elvis is morose, overly talkative, and mischievous, and he is also prone to telling lies and easily gets on Jesse's nerves. He is invited on their trip to San Juan Island so that he and Jesse might get to know each other.