Mike enlists an old Army buddy to help take down a drag racing gang which is also in the business of arms smuggling overseas. Sarah joins Mike and KITT despite her father's disapproval.

Sarah is upset over her father's death and decides to leave town. A concerned Mike finds the answers he was searching for about his past while looking for Sarah. Now that Dr. Graiman is dead, the NSA has decided to dismantle the SSC and move ahead in creating KITT's nemesis, KARR. The chip which contains KITT's memories and personality is removed and placed inside of KARR, with the permission from Torres'. Mike, Sarah, Billy and Zoe create a plan to find KITT and get it running, then hunt down the evil KARR and destroy it.

Mike and Zoe go undercover in Baja as a honeymooning surfer couple in order to stop terrorist weapons from getting into the states. Sarah and Billy are brought into the mix and they quickly find the mission taking an unusual turn.

When a tech is murdered inside of Knight Industries, the team must track down the person that infiltrated headquarters before they strike again. Meanwhile, Mike and Sarah find themselves stuck together during a storm.

Mike and KITT must find a stolen serum which will result in the recipients maximum physicality when used, before it lands into the wrong hands. Meanwhile, Sarah's new duties have her overwhelmed as she quickly learns what it will take to re-institute the Foundation for Law and Government.

Billy tags along with Mike as he heads to Vegas on a mission to stop a money laundering ring, and Billy has his eye on finding romance along the way. Meanwhile, The KITT cave is assessed and also locks horns with an old nemesis, Dr. Graiman.

The world is in jeopardy when a devastating computer virus is released. With Kitt infected by the bug, it may mean the ultimate stall out. Elsewhere, Mike becomes jealous when Sarah and her ex-beau reconnect.

A lethally poisoned Mike must fake the assassination of a tech bigwig in order to obtain the antidote. Meanwhile, hallucinations and the reemergence of an enigmatic woman shine light on Mike's hazy past.

Michael and KITT continue on a mission to rescue an ambassador and foil the terrorists holding him. The quest becomes even more dangerous when a bomb is placed inside of KITT, set to explode when the car reaches a certain speed. Meanwhile, Sarah receives shocking information regarding her father.

Mike's old Army friend recruits his help to investigate the suspicious death of a tough-as-nails drill sergeant Jack Burber. Mike learns that the drill sergeant was participating in an underground fight club for military veterans for extra money. In order to find out what really happened, Mike has to infiltrate the fight club and try not to get himself killed in the ring.Source: NBC

When a plane transporting a 10-year-old federal witness crashes, Mike determines that the accident was faked and that the boy was kidnapped. He clashes with the investigating DEA Agent, who promptly arrests him for interfering with the case. Meanwhile, Sarah fights for more authority over the SSC's future endeavors.

Mike and KITT must deliver a package -- a task that seems easy enough until they learn the package is a man with a code built into his DNA. The task becomes more difficult when a mysterious woman gets in their way.

Knight Industries tracks down a Bonnie and Clyde-esque couple and find that their true identites will affect a congressional race. Meanwhile, Mike and KITT must find a way to save Agent Rivai.

A deranged terrorist has kidnapped a foreign ambassador, sending Michael and KITT out to the rescue. Elsewhere, a damaged robot has Dr. Graiman and Sarah teaming up to repair it.

Mike goes undercover as an AWOL Marine in order to find a rogue military officer. A beautiful undercover agent pairs up with Mike to help him solve the crime. Back at the SSC, Billy undergoes training with the help of Zoe.

Mike becomes a hostage in a bank robbery when he becomes entangled with one of the robbers. As he tries to stop the thieves his efforts are hampered by the twists, turns and being uncertain of what the motives for the robbery was all about.

During his "decompression" time, Mike visits an old hangout---Sonny's Bar---and helps the new proprietress restore the joint to its original glory. But Mike must square off against a mysterious someone who wants the bar sold, and that person may resort to arson to fulfill that desire.