<Ul> <Li> Michelle Morgan as Samantha Louise "Lou" Fleming Morris </Li> </Ul> <Li> Michelle Morgan as Samantha Louise "Lou" Fleming Morris </Li> <P> At the beginning of the series, Lou moves back home from her job in New York City to help run Heartland . She is initially reluctant to stay in Hudson because she has a long - term boyfriend and a lucrative job in New York . Upon discovering Heartland's poor economic situation, she crafts a financial plan to pull the ranch out of debt and make it successful . However, she is told by a financial advisor at the bank that her presence at the ranch is essential to secure the loan necessary to implement her plan . Once Lou decides to stay, she runs the business end of Heartland, taking care of appointments and setting rates for stabling patient horses . She later sets her mind to starting a new business venture: The Heartland Equestrian Connection . This idea is met with much resistance, especially from Jack . Family members derisively refer to the business as the "Dude Ranch", and the name sticks, though no longer with its negative connotation . Along the way, Lou breaks up with her boyfriend from New York and tries to re-kindle a romance with the local vet, Scott Cardinal . In season two, Lou's relationship with Scott dissolves . She meets her future husband, Peter, thanks to a setup by Jack's girlfriend Lisa, and starts a secret relationship with him due to Peter's job in the oil industry . Lou had previously rallied the local ranchers against Peter's oil company, and expects Jack would not approve of her choice of boyfriend . Later, Lou's relationship with Peter is more public and they marry at the end of season 3 . They move to Dubai, but she soon feels very alone in such a foreign country and grows to miss Heartland and her family . When they move back home, Lou finds out she is pregnant . She later gives birth to a girl named Catherine Marion Minnie Fleming - Morris (often referred to as Katie). After several failed attempts to buy a place of their own and even to build a home somewhere on the 600 acre property at Heartland, Lou and Peter buy Mr. Hanley's ranch from Mrs. Bell and they plan to move into it and refurbish it . However, faulty wiring in the structure causes a fire, and the buildings and stables burn, leaving them no choice but to remain at Heartland . Lou has a positive relationship with her sister Amy, providing a listening ear and timely advice when she needs it, and Amy often plays the same role for Lou . Lou is also close with her father, Tim, and she is the first one to reconnect with him after Marion's death . In Season 6, Lou and Peter decide to adopt an orphan named Georgina Crawley, whom Jack had been fostering after discovering her hiding in the loft . In season 8, Lou and Peter start having relationship problems since Peter is constantly in Vancouver for his job . On Amy's advice, Lou goes to Vancouver to talk things over with him, but they decide to separate . Peter returns to Hudson to try to persuade Lou that they can work things out, but she is not interested, since nothing has changed . Lou later tries online dating, and seems to be falling for the new stable hand, Mitch . Peter visits regularly for his daughters, and interferes with Lou and Mitch's budding romance whenever he is at Heartland . In season 7, Lou buys Maggie's after Maggie moves to be with Soraya in London, England . She runs it with Tim, who acts as her business partner . Lou eventually works on bringing Maggie's to New York City and spends much of her time flying back and forth, with the rest of her family taking care of Georgie and Katie . </P> <Ul> <Li> Shaun Johnston as Jackson "Jack" Bartlett </Li> </Ul>

Who does lou end up with on heartland