Amy is surprised when a very pregnant Mallory shows up at the ranch with a wild horse. Jack and Tim face new competition, and Lou grapples with a familiar opponent in her campaign to be re-elected.

Amy and Jack retrain Edwin's horse for carriage racing, bringing Amy and Edwin closer. Logan takes on his first client horse. Election night arrives for Lou just as the family faces a difficult loss.

Amy helps Caleb with his son's pony. Lou and Jessica start a new venture, while Katie tries a risky new hobby. Logan takes a big step in his relationship with Miley, but then disaster strikes.

Amy must deal with Lyndy's sudden fear of horses. Logan blames himself for Miley's accident. Tim enlists the family to make Shane's return to Heartland perfect, while Katie struggles with a friendship.

Amy and Jack train Blue for a competition. Lisa deals with a difficult loss. Lou lets Jessica down in their partnership for the gallery. Katie secretly buys a used dirt bike.

At the competition, Amy has a run in with an old friend that leads to heartache. Jack and Lisa prove they can be adventurous. Katie stands up for herself when Ellie and Brandon push her too far.

Lou's forced to face the reason for her insomnia. Amy works with a new client who has a surprising connection to Katie. Jack wins over a prickly dude ranch guest.

Amy and Nathan retrain his horse. Tim navigates new family dynamics when Miranda shows up early to help with Shane and Chloe's wedding. Jessica has to heal a rift with Jack.

An accident puts Shane's wedding in jeopardy. Nathan tries to make amends with Amy while helping his traumatized horse. Heartland Beef faces an uncertain future. Katie finds a new side of herself.