It's graduation day and the Walker family is turning a corner into a seemingly hopeful future that is until Cordell goes missing, and his mysterious captors are trying to break him down physically and mentally. Meanwhile, Captain James, Cassie and the rest of the Rangers have all hands on deck to bring Cordell home safely but Stella has ideas of her own on how she can help.

While Cassie and James lead the charge to find Walker, the situation goes from bad to worse when Liam also goes missing. Meanwhile, Stella and August pursue a lead of their own.

Time is pushing forward but Cordell is stuck trying to convince everyone, including himself that he has moved on from the hell of captivity. Meanwhile, Stella comes clean to her dad about how she has been feeling and Bonham shares with Liam a way to work through his trauma.

Walker, Cassie and Captain James team up to put Trey through the final stages of his training, a "Rangers hell-week" that will ensure he's ready to join the ranks of the elite organization, but it's not only Trey who is put to the test, Walker hasn't worked with Cassie in weeks and both struggle to get their partnership back in sync.

During a would-be simple assignment, a misunderstanding causes Walker and Cassie to examine where they are in life and what lies ahead. Meanwhile, August strives to roll with the cool kids to disastrous results and Trey struggles with what being a Ranger means for his relationship with his mother.

Walker makes good on his promise to Liam to finally discuss captivity, and painful details from the past inform the present to help the Rangers eliminate a dangerous threat. Meanwhile, a new case forces Cassie to confront her aversion to dating.

Walker attempts to make this the most memorable Thanksgiving ever in the hopes of luring Stella to return home, but when the family's annual "Circle of Thanks" turns into a circle of grievance, tensions bubble over- leaving things worse off than they began, with one member of the Walker family being rushed to the hospital.

In the aftermath of the Walker's dramatic Thanksgiving dinner with Abeline's (Molly Hagan) traumatic hospitalization, the family rings in the new year with members of the Walker family resolving to make better choices across the board. While Cordell (Jared Padalecki) throws himself into family matters, Cassie (Ashley Reyes) pulls Trey (Jeff Pierre) into a case tracking down an elusive tech mogul. But Cassie gets the sense she's in hot water with Captain James (Coby Bell).

Cordell and Cassie intervene in a hostage situation at a server farm, but something Trey finds indicates something more sinister is at play. Meanwhile, August tries to smooth things over with his grandparents, Liam attempts to step up his responsibility within the family business, and a luncheon awkwardly reunites Cordell with someone from the past.

Cordell is tipped off that Grey Flag may still have him as their prime target. Meanwhile, Captain James has discovered that Cordell and Cassie weren't truthful about some top-secret information and Trey's involvement in the prior week's case lands him in hot water. Abeline and Bonham disagree on how ready Cordell is to handle his responsibilities, while Liam continues to pursue his new business venture, despite his dad's displeasure over his son's new partner.

As Cordell and Cassie dig deeper into the passings of his military buddies, he uncovers some inconsistencies that may reveal truths he's not ready to face. Meanwhile, Trey is presented with a new opportunity, Captain James receives some news from Kelly and Bonham is still at odds with the rest of the family.

Cordell and Cassie soon realize they aren't the only ones keeping secrets, leaving Cassie to question who she can trust. The rest of the family focuses on the horse rescue, but they still find themselves facing a few challenges.

After a shocking revelation, Cordell and Cassie set off to find out more about Grey Flag's nefarious plans. Liam's and Stella's plan for the horse rescue appear to finally be coming together when a big-time philanthropist offers her support, and the Walker family joins forces to move the project along quickly. Trey's new assignment lands him in unfamiliar territory and a new partner could compromise his focus.

Stakes are high as Cordell, Cassie, Captain James and Trey all realize Grey Flag's plans and partnerships extend deeper than they once thought. While the Walkers plan for the Mayor's Medal Ceremony, Cordell struggles with missing out on time with his kids as he focuses on trying to keep the whole city safe.

In the thrilling second half of a two-part episode, the Texas Rangers and the Walker Family must contend with Grey Flag's plans and one truth... that everything was a lie.

An old friend returns with a shocking surprise for everyone, and Cordell is forced to come to terms with the decisions he's made and how it's affected the ones he loves most. In the aftermath of the devastation caused by Grey Flag, Trey's left feeling like an outsider, but a new case will force he and Cassie to overcome their issues.

It's an exciting day for Liam, Stella and the horse rescue as opening day is upon them! Then the boys are off for a camping trip while the ladies plan a relaxing day at the spa... but nothing ever goes as planned.

It's a big day for the Texas Rangers and the Walker clan as friends and family gather to celebrate a very special event.