In a short resolution to season three's cliffhangers, it turns out that Garcia and Dangle are pulled out of the car safe (and naked), and, unfortunately, the call placed to the prison was a wrong number, so Craig is killed. Six months later, Wiegel comes back from her "personal leave" pregnant. It turns out that it was not Craig that impregnated her, but rather via a sperm bank that Junior and Dangle may or may not have contributed to. Also, Carrot Top goes insane in a Harrah's hotel, throwing furniture out of the presidential suite, shooting at people and stealing police cars.

Garcia goes undercover to bust employers who hire undocumented alien workers, and Junior spends a day with his brothers.

Competition among the deputies for a jet ski inherited by the department turns ugly.

When a crime wave floods the streets of Reno, the Sheriff's Department is helped by Citizens Patrolman Rick.

"Spanish Mike" Alvarez returns to wreak havoc on the Reno Sheriff's Department.

After Sheriff Chechekevitch is killed in the line of duty, the deputies swear vengeance.

The deputies continue investigating the murder of Sheriff Chechekevitch at his funeral.

Hotty's Restaurants become the corporate sponsor for the Reno Sheriff's Department.

Kimball takes Clementine to her Christian Karaoke singles' mixer.

As Raineesha and Trudy consider trying to get raises in the election for deputies, Jones and Garcia tangle with a drug dealer who may be a D.E.A. agent.

Jones and Garcia get transferred to mounted patrol, only to discover that not just anyone can dispense justice from horseback.

Kimball tries arresting a magician performing without a permit, who cano get out of whatever restraint she places on him. Dangle accidentally releases a child killer free. A customer wants to file a complaint against the brothel for fraud. Junior and Jones deal with a drunk at a Renaissance Festival.

Dangle visits his ex-wife and her new husband on their anniversary. Meanwhile, Trudy, Clementine, Raineesha, and Cheresa stake-out a lecherous Meth Dealer and his girlfriends.

Dangle accepts a wedding proposition from his ex-wife's husband, but before he ties the knot, Wiegel gives an even bigger surprise than she planned.