The town of Hudson in the foothills of the Rocky Mountains is home to Heartland, a family ranch dedicated to rescuing and rehabilitating troubled horses.

The coming-of-age story of young Jacob McKay, who becomes stranded with his family in the Rocky Mountains, where they are befriended by human and animal helpers, including the grizzly known as Walking Thunder.

Continues to follow life on the ranch as people drift back to Heartland, craving the familiarity of home and family only to discover that everything seems to have changed. After the blush of first love in season three, Ty and Amy's relationship may blossom and mature, but only if they face up to a misunderstanding about what happened while they were apart. Includes all 18 episodes of Season 4.