Set several years after the first film, Ariel and Prince Eric are happily married with a daughter, Melody. In order to protect Melody from the Sea Witch, Morgana, they have not told her about her mermaid heritage. Melody is curious and ventures into the sea, where she meets new friends. But will she become a pawn in Morgana's quest to take control of the ocean from King Triton?

While Jane Holman is driving with her two sons, she accidentally runs into a drifter, Jack McCloud, who breaks his leg. Being responsible, Jane invites Jack, and his dog, to stay at her home until his leg has healed. Jack struggles to adapt their lifestyle, and finds himself loved by the family.

On their way to start a new life at a sheep farm in rural Virginia, the Turner family are halted by a wreck on the highway that has claimed the life of a truck driver. Spotting the trucker's now-abandoned collie on the side of the road, they take pity on the dog and adopt her. As the city family copes with the change to rural life, including a feud with a neighboring farm family who resent the city interlopers, the ever-loyal Lassie helps them adjust to their new surroundings.