Modern-day Texas Ranger, Cordell Walker's independent crime-solving methods have their roots in the rugged traditions of the Old West. Walker's closest friend is former Ranger, C.D. Parker, who retired after a knee injury, and now owns "C.D.'s," a Country/Western saloon/restaurant. Rookie Ranger, James "Jimmy" Trivette is an ex-football player who bases his crime-solving methods on reason and uses computers and cellular phones. Alex Cahill is the Assistant DA who shares a mutual attraction with Walker, but often disagrees with his unorthodox approach to law enforcement.
A senator proposes to save money by disbanding the Texas Rangers. But when his daughter is kidnapped by a gang of jewelry store robbers, he refuses the Rangers' help, choosing to rely on the F.B.I., although Walker and Trivette have a better chance of locating the kidnappers in time.
A dead child's spirit assists Walker to discover who murdered him eight years ago.
While on a fishing vacation together, C.D., Trivette, and Walker reel in more than they bargained for when they accidentally uncover an elusive and illegal drug operation.
C.D.'s niece is kidnapped by her ex-boyfriend who forces her into a string of bank robberies. Walker and C.D.'s pursuit of them becomes further complicated when a radio show host "Tumbleweed Tom", unaware of what's really going on, offers a bounty on their Bonnie and Clyde-style bank robberies.
Walker and his friends are on a fishing trip in the wilderness in a cabin run by Hank Cotton an old friend of Walker and CD, square off against a group of Drug Runners run by Glen Larkin and his younger brother Chip.
Hayes Cooper, the legendary bounty hunter sets out to get justice for the Wilsons.
After surviving a rattlesnake attack, Walker with Trivette's help continues his pursuit of the killers who uncovered "Cooper's Gold."
Walker must find a way to prove a condemned man's guilty plea was the result of blackmail before he's executed.
Alex seeks to prosecute a gang who terrorizes witnesses with arson, and attempts to murder firefighters responding to their blazes.
Walker tracks down a hijacked ambulance containing an urgently needed donor liver.
Walker's cousin, David Little Eagle Jackson, returns to the reservation following studying medicine to find many do not like him, including his girlfriend's father, whose murder he soon witnesses.
Trivette goes undercover into jail to infiltrate and destroy a drug ring. During a hurricane the transport crashes; the prisoners can escape and are hiding with hostages in a remote hotel. Among the fugitives: Trivette. When the transport is overdue Walker starts searching and lands up in the hotel where he goes for the prisoners one by one with the help of a handicapped person.
To get information on a gang who destroyed a friend's life via blackmail, Walker and Trivette join by posing as street fighters.
Victor La Rue has been declared fit for trial. During the course of the hearing, La Rue manages to subdue the bailiffs and get their guns. He then demands that Walker come here but Walker is out chasing down some criminals. So while La Rue taunts Alex.
Angel, Trivette's old girlfriend, comes to town looking for her father and asks for his help.
After an amnesiac finds nerve gas at a genetic research facility, they need Walker's protection.
A desperate man named Hank Berigan asks Alex for help in persuading his daughter, Amy, to leave the cult that she has joined. When Alex goes to the cult, she is imprisoned within, realizing that once someone enters the cult, they are never allowed to leave.
A Texas Ranger wannabe tries to upstage Walker by capturing prison escapees, buts gets innocent civilians in harm's way as well.
Walker is not able to arrest Mick Flanders because his sister is in the Witness Protection Program. Mick, proving that he's invincible, kidnaps a boy named Archie who was staying at Walker's ranch.
A series of high-profile robberies puzzle the Rangers, but when one results in the death of Walker's friend, it becomes a personal crusade.
Paroled on a technicality, Victor LaRue pretends to have changed as he takes revenge on Walker and Alex.
After saving a female Mexican immigrant who was brought in illegally and forced into prostitution, Walker goes undercover with Mexican agent Jesse Rodriguez as a peasant to track a large operation of slave-labor smugglers in Mexico that are migrating Mexican immigrants into the United States illegally by tricking them with false promises of providing them with a better life.
To help stop gang related activites, Walker organizes basketball tournaments amongst a group of interracial kids.