Alex and Walker survive the plane being shot down, but the killers track them where they landed. Search teams try to find Alex and Walker and must get to them before they are killed and before the court case is dismissed without evidence.
Walker and Trivette receive a message from terrorists, who threaten to blow up enough anthrax to kill one million people in Dallas, if they don't receive $100,000 and the release of another terrorist from prison. It's a race against time as Walker and Trivette hunt for the bomb.
When a man, Lloyd Allen, whose willing to testify against his boss, Vince Termin who is dangerous man who killed another man who was going to testify against him. Walker sends Gage and Cooke to get him but when they arrive Termin's men are there but they manage to get away. Walker and Trivette try to help them.
Gage's sister is a reporter. She goes undercover to investigate a crime boss operating at a local bar. When she goes missing, Gage and Sydney go undercover to find her. Meanwhile, Walker and Alex go on a camping trip.
The HOPE Center hosts a charity rodeo to raise money. During practice, a man sexually harasses a woman; Trivette rescues her, but the man is accidentally killed by his own hand. The dead man's father decides that Trivette must die.
When Walker visits a school for his Kick Drugs program, he witnesses a young boy's suicide. He learns that the boy's death was because of harassment he was getting from some students who are members of a gang. Walker then decides to spend some time at the school to look into it. Gage and Cooke are trying to get a criminal.
An employee at a research facility realizes his company is making sarin nerve gas and plans to release it. The man asks his brother Danny to help collect evidence for the police. They are caught; the man is killed and Danny hit by a car.
Men dressed as Santa's rob the armored trucks picking up donations from Santa bell ringers. Gang members rob a church where former gang members attend, causing the church goers to get in contact with their gang again.
A criminal whose operations Walker and the others have been foiling decides to take them out, so has one of his men plant a bomb when they're all together. Walker sees him and discovers the bomb and tries to get rid of it but it blows up in his face. At the hospital they learn that Walker's blind and the doctors are uncertain if it's permanent. Gage and Cooke try to get the man who did this. Alex tries to help Walker cope but he's impossible. White Eagle shows up and tells Walker that he shouldn't worry if he can see again but to learn how rely on his other senses. ...
A young girl is shot when some men who committed a crime were shooting their way out. Her father is a former Ranger whom Walker knows. And he sets out to find the one who shot her. Walker tries to caution him about what he is doing. He gets the man reinstated.
When a new weapon knows as a Thunderhawk is stolen, Walker tries to find it. What they don't know is that the man who was in charge of bringing it to the military was the one who stole it. He's planning to sell it to some people who plan to use it for terrorism. But before he could it's stolen from him.
Walker returns from Los Angeles with Eagleton, the paramilitary man who killed a Texas Ranger and who was planning something in Los Angeles Walker turns him over to some other men and it's while in transit that some men kill the men escorting Eagleton and spring him. Walker tries to find him, knowing that he is planning something. Sammo Law, the Chinese cop in Los Angeles who helped Walker catch Eagleton, comes and has some information he got from Eagleton's associates.
A Chinese diplomat who is a friend of Walker's is in the country to bring some students to his country. Later when one of Chinese Embassy staff turns up dead Walker and the others investigate. Gage has a run in with the diplomat's son and because his father is a diplomat has diplomatic immunity. Gage is not pleased and thinks they should keep an eye on him. They later learn that the staff member may have been involved with drug smuggling. And that the diplomat's son is the one behind but because of his diplomatic immunity they can't touch him.
Dallas prepares for a ceremony to promote unity among the races. A white supremacist group goes to Dallas with the intent of placing bombs to destroy the unity. Gage takes a young boy under his wing to keep him from joining a gang.
When Detective Steven Nimh who infiltrated the organization of Billy Lo and has given Walker very useful information about Lo's operations. Walker feeling that Lo might be suspecting that he has a mole in his organization wants Nimh to pull out. But Nimh sensing that something big is going down decides to stay in. But Lo sets him up and is killed. So Walker with what info Nimh gave them tries to get Lo. At the same time Nimh's father who's a friend of Walker's comes and tries to help his grandson deal with his loss and some other problems.
Walker has been able to intercept all the drug shipments of the Ortega brothers. But when they discover that Walker has an informant in their midsts they kill the informant. In the meantime, they still continue to bring drugs in by having people sneak across the border by going throw a ranch owned by Alex's friends. But when the husband catches them, he calls his foreman for help but he kills the man, apparently he works for the Ortegas. Upon learning of what happened the Ortegas make plans to buy the ranch.
Ortega abducts Alex, Cooke and some other people and demands the release oh his brother. Walker knows the man won't keep his word but a Fed allows the exchange but as Walker predicted Ortega doesn't release Alex and Cooke. Walker then goes across the border to get them and Trivette and Gage go with him.
Just as Walker and Alex are about to go on their honeymoon, the assassin who was hired to kill Alex and whose partner Walker killed, sets out to get them. And he's determined to do it. Even if he has to bring down the plane they're on.