Reiko, a beautiful Japanese-born widow whose Nisei husband was killed in Vietnam is murdered and Sgt. Friday (Jack Webb) and Officer Gannon (Harry Morgan) are assigned to find her slayer, in "The Gun", this week’s episode of "Dragnet". The only clue left by the murderer is a slug, which lodged in the floor of Reiko's home after it passed through her head. But a detailed search of the neighborhood uncovers further leads with considerable help from Lurlene (Annazette), a victim of an assault a week earlier. Sharann Hisamoto portrays Miko, Reiko's 5-year-old daughter, Kathleen Freeman is Mrs. Pound and Anne Loos portrays Mrs. Edney. Raymond Mayo is featured as Ben Yoder, the painter.

Sgt. Friday (Jack Webb) and Officer Gannon (Harry Morgan) are about to wrap up a routine suicide investigation when the police laboratory chemist develops a bizarre twist to the case, in "The Bullet". All physical evidence at the home of Nora Hamlin (Carol Byron) indicates her estranged husband shot himself over their separation. But closer study by Forensic chemist Ray Murray (Olan Soule) sends the detectives back for further investigation. Mabel Albertson portrays Jessie Gaynor, Nora's mother.

Sergeant Friday and Officer Gannon are called to a theater to investigate an acid-throwing incident. Traced to his home, a teenage suspect runs away — carrying a live grenade.

Sergeant Friday is in real trouble when he shoots and kills, in self defense, a man he catches jimmying a coin changer who opens fire on him. But he can’t seem to find the robber’s spent bullet.

A Midwestern businessman is swindled by shakedown artists who pose as vice officers. Sergeant Friday and Officer Gannon go undercover at the same hotel, with Gannon playing the role of a manufacturer from Nebraska.

A bank robber forces female passersby to help scoop money into a pillowcase while holding the bank’s employees at gunpoint. Sergeant Friday and Officer Gannon receive unexpected assistance from an involuntary “helper".