It's been four months since Ty's sudden and unexplained departure, and Amy has moved on and become used to working with Caleb Odell, Heartland's new stable hand. With Amy's 16th birthday just days away, Lou is busy planning a surprise birthday party for her sister.

The spring cattle drive is a much-anticipated event, and Lou hustles everyone out of the house at the crack of dawn for a secret all-day date with Scott. Simmering tensions rise to the surface as Amy seems more interested in getting roping tips from Caleb instead of riding with Ty.

Lou is forced to reconsider her choice to live and work at Heartland when her former New York colleagues arrive for a weekend equine retreat. Amy is unsure whether she can trust Ty.

Out for a ride along the river, Amy comes across an RCMP officer desperately trying to save a young boy from drowning. Scott misinterprets Nick Harwell's polo match invitation to Lou as a date. Mallory seeks Jack's advice on how to deal with her love life.

Lisa meddles in Lou's business and personal life with disastrous results. Lisa brings a "cursed" horse for Amy to treat. The beautiful Andalusian named Diva Girl has been returned to Lisa by multiple owners.

Lou goes head to head with Big Alberta Oil when seismic surveyors force their way onto Heartland.

Amy is thrust into the limelight when she performs a miracle on a traumatized horse and a video of the event is posted online.

Jack's truck is on its way to rust bucket heaven, forcing him to find the courage to say goodbye to a part of his past.

When Tim buys a racehorse from Lisa, he puts everything on the line, including Amy, to win big.

Ty protects his mother Lily from his abusive stepfather, who shows up at Heartland to win her back.

Amy faces a tough moral dilemma when she discovers Mr. Hanley has abandoned his horses and is on the brink of losing his farm.

Caleb struggles to get over the physical and emotional scars from his terrible accident as Amy tries to get him back on a horse and Tim doles out some tough love.

A surprise announcement by Peter throws Lou's wedding plans into disarray while Amy and Ty are forced to make difficult decisions about their futures.

Amy tries to pretend that nothing has changed when Ty returns to Heartland with a surprise guest.

When an unspoken attraction re-surfaces, Amy discovers that honesty might be the best policy, but it certainly isn't the easiest one.

A looming high school graduation and Spartan's near fatal bout with colic forces Amy to face where her future really lies.

When Amy and Ty convince Sarah, the town recluse, to let them treat her sick horse at Heartland, the family helps her face the ghosts of her past..

Amy and Kit have to put their differences aside to on Caleb in a team-roping jackpot.

Jack is forced to revisit a rough patch in his marriage when he finds an unfinished song by Lyndy in her old guitar case.

Jack is forced to revisit a rough patch in his marriage when he finds an unfinished song by Lyndy in her old guitar case.

Amy and Ty work through their trust issues as they train a pair of Clydesdale's, but it is an emergency at Heartland that reveals their true strength as a team when it matters most.

When Tim reveals to the family that Shane is his son it throws everybody for a loop and threatens to ruin the traditional Bartlett-Fleming-Morris naming ceremony for Lou's baby girl.

A friend from Jack's past shows up at Heartland when one of their old band mates passes away. Lou & Lisa secretly try to gather the other remaining members for a reunion performance to celebrate Jack's birthday.

When Amy bravely tries to heal an abused (and now extremely violent) racehorse Ty and Jack think she's finally bitten off more than she can chew.

Amy is roped into helping Tim project a positive image to the community, in hopes it will further his custody case for Shane.

After working with Ty and Caleb's barrel-racing horse, Amy competes in a high-stakes Futurity.

Everyone rallies around Jack as he struggles with the inevitable loss of a friend. Georgie gets some unwanted help with her schoolwork.

As Amy and Georgie prepare to compete in a cowboy competition, Georgie guilts Jack into helping her train on a new horse in the hopes he will fall in love with the animal.

Ty and Amy’'s attempt to rescue an injured eagle in the mountains takes a dangerous turn.

Amy's attempts to help Georgie deal with an impending departure are complicated by Olivia.

Georgie begins to second-guess her decision to run away from Heartland, while the family bands together to find her.

When Ty helps Jack and Tim on a cattle drive, an accident jeopardizes their plans.

Tim asks Amy and Georgie for help to discourage Jade from accepting a suspicious sponsorship deal.

Amy and Cass work together to save a racehorse with a career-ending condition, while the arrival of a former girlfriend forces Tim to see his current relationship in a new light.

Lou finds herself trapped at the Dude Ranch with Mitch, the new ranch hand, and they both reveal the circumstances of their recent pasts.

While trying to help Cass learn to handle a spirited horse, Amy discovers there is more riding on their success than she initially realized.

When their plans to get away are thwarted, Amy and Ty celebrate their first anniversary closer to home and Amy unveils a special surprise.

As Amy and Ty prepare for parenthood, they work together to resolve a dangerous pregnancy issue. Meanwhile, Georgie may be forced to give up something she loves when a demanding new Extreme Team coach arrives on the scene. Then, Lou has to decide whether she should tackle a new business venture that may take her away from the Heartland family. When Jack and Mitch work together with the herd, Tim is not ready to be pushed aside. And Georgie and Adam find the perfect way to celebrate an anniversary.

When one of Tim's team-building events turns competitive, Georgie gets stuck partnering with Jade's cocky rival.

When Amy helps a mounted archer reconnect with her horse, she also unravels the mystery behind Spartan’s recent behavior.

Jack is shocked to learn the reason for an old friend’s unexpected visit to Heartland.

An unexpected guest arrives which makes Amy and Jack question the reason behind the visit.

Jake's unexpected arrival at Heartland forces Mallory to admit to Amy and Jack the real reason she came back to Heartland.

Amy and the family pull together as the gravely ill Ty returns home and is admitted to hospital.

With Caleb and Cassandra's wedding as well as the birth of Amy and Ty's baby on the horizon, everyone is rushing to make sure both events go down without a hitch.