When an undercover agent is killed, Walker tries to track the killer with a convict with inside connections. But the plan goes wrong when the murdered agent's brother, an AWOL Marine, tries to take justice into his own hands. Walker must get to the killer before the Marine and his other siblings take the law into their own hands.
When Walker busts an explosives expert who is in town to work a big job, he is surprised to find that he looks just like Charlie Brooks, the accountant Walker arrested awhile back. To make up for his community service, Walker sends Charlie in to try to help the Rangers bust the job before it strikes somewhere in the city.
When Walker finds a young malnourished boy during a meth lab raid, he grows extremely close to the boy. Walker and the boy have a lot of similarities in their childhood and the boy's mother has been taken hostage by her meth addicted boyfriend. Walker decides to keep the boy with him and teach him many of the things he knows of life while he and Trivette search for the boy's mother.
After Lucas' mother passes away, Walker struggles with how to tell Lucas of his condition. However, with a trip to the reservation for some soul searching, and the toughness of the young boy, they face the problem together. But all the while, the meth dealer who left Lucas' mom for dead is still after the boy who holds the key to his riches and freedom.
Songs: Gino Vanelli & Anton Vanelli -- Rose In December
When a friend of Trivette's has an issue with her father at a nursing home, Trivette gets an uneasy feeling about the establishment. After further investigation, things seem fishy. Suspecting that the doctors at the nursing home are experimenting on patients with Alzheimer's, Walker and Trivette send in C.D. undercover to try to get to the bottom of the issue before any other patients turn up deceased.
While visiting the Texas Ranger Hall of Fame, Walker begins the legendary story of Hayes Cooper for a group of school children. An outlaw with a soft spot, Cooper rides into a small Texas town and comes to the aid of a struggling rancher, whom a local tycoon is trying to get rid of. With his first real friends in a long time, Cooper fights to save their ranch, but the consequences could be deadly.
After the quiet life Hayes Cooper had hoped for is ruined, he goes on the trail of the outlaws who wrecked it. It leads him all across Texas, and eventually to a badge as a Texas Ranger. But the man he is after is known for his draw - and Cooper has to be quick or he will wind up like another famous ranger who faced this outlaw...
When Walker is contacted by a young boy who says he is in danger, he and Trivette run into a wall trying to find information about the place the boy says he escaped from. Once found, the boy and his super computer help Walker and Trivette to track down multiple cover-ups the company has taken in its attempt to keep the boy and his special powers under their control.
Walker and Trivette begin a camp for felons to try to turn their lives around as the Texas prison system is getting full. Walker's program, run like a boot camp, comes under pressure from legislators who feel it is a bad idea. When some things at the camp don't go as planned, Walker must show everyone that the camp can change lives before it is closed down for good.
When some friends of Walker's enter into a thoroughbred match race, they pick the wrong owner to race against. With an evil streak, he will stop at nothing to prevent Walker's friends from winning the race - even if that means killing. Walker must find a way to help them before they lose everything they have.
When one of Walker's old friends begins to work construction in Dallas, she comes across some fishy construction from the Super and the Foreman. Fellow co-workers advise her to keep her mouth shut because the site has been known to have "accidents." When Walker's friend refuses to keep quiet, Walker must help her take down the crooked builders before they get to her and her family.
When two recently adopted children Walker knows run away from their new home, the Rangers go to work finding them. The children end up tied up in another Ranger investigation into illegal sweat shops. Walker must find the kids before they end up like others associated with the shops.
A research dig is going on at the Reservation and a friend of Walker's is mesmerized by the woman running the show. When she shows up dead after rejecting his proposal for marriage, Walker must find a way to prove his innocence while uncovering the deeper activities occuring at the research site.
When a group of dangerous prisoners escapes while being transported, they escape to a church that has significance to their leader. The problem is compounded when it turns out Alex and her battered women group are meeting at the church. With Alex and others hostage, Walker has to find a way to save them all before hostages start being killed.
C.D. is hired as the interim security director at a posh resort. When the resort is prepping to host a party featuring some of the richest men in the region, the governor calls on the Rangers to provide some extra security, which turns out to be timely when an inside plot to extort millions from the party patrons is put into full effect.
A woman and her son have fled to Dallas after she witnesses a murder. But the killer is on her tail and its up to Walker and her husband, a pro wrestler, to protect their son and stop the killer before he gets to anyone of them.
During a chase for a group of robbers, Trivette mistakenly shoots a little boy, putting him in critical condition. Faced with the impending investigation consequences and guilt, Trivette is unreachable by anyone, including Walker. Walker has to find a way to comfort his friend or overcome this issue before it brings down his partner.
Walker takes on a case with old friend and Detective, Carlos Sandoval requiring Carlos to go undercover with a dangerous drug king. But when the cartel finds out his true identity before the Rangers decide to bust the operation, Carlos may find himself six feet under before anyone can take down the operation
With Trent Malloy's personal protection business growing, he gets a new client who has been abused by her husband. But her husband is more dangerous than the average wife-beater and Trent will need help from the Rangers to take him down before he can hurt Trent's client again. But after some help from Alex, the Rangers run into a problem of their own...
The Rangers go on a search for a friend gone missing, only to have the case take a turn for the worst when her son is kidnapped. High stakes are at risk with major corporations and new biotechnology that could change the world and Walker must find a way to save his friend and her son before the technology can be put into use by those who want to use it for their own gains.
Trivette helps out an old friend in a quest to find her dad, only to find himself double crossed by a woman gone bad. When she makes a mistake and lets Trivette live, he vows to stop at nothing to bring her to justice, along with the gang she worked for.
When a group of Neo-Nazis headed by a leader with an old grudge, focuses on Trent's father's old church, things get ugly. The congregation is faced with numerous racial battles as the hate group gets more and more violent. The Rangers must find a way to stop their disgusting actions before the end up as the downfall of the entire church.
Songs: Collin Raye -- Little Red Rodeo
When an old friend of Walker's reunites with her husband who is released from jail into a halfway house, it causes some tension with her bitter son. But while the family tries to make things right, they are drug back into a bank heist by a crooked parole officer and Walker has to help them get away from the wrong people before their family ends up broken again.
A local middle school in East Dallas is increasingly affected by warring gangs. After a pair of students and a beloved teacher are gunned down over the tension, the Rangers are called in to put a stop to the violence. With Walker leading the way and the help of some students, they try to turn the school around before it becomes "gang territory."
Some fellow law enforcement and friends of Walker's are to be married in the highest profile wedding of the year. But amidst the planning, they are both instrumental in trying to take down one of the largest car jacking rings in the country. As their wedding day finally arrives, they and their guests are in for a surprise as the leaders of the ring attempt to exact their revenge.