1968 is a year in the 20th century.
- Detective Frank Briggs retires from his position in the Baltimore County Sheriff's Department after forty-five years. (TXF: "Squeeze")
- Dr. Saul Grissom is assigned by the US Marine Corps to work as a physician at Paris Island. (TXF: "Sleepless")
- The Caprice car company releases a station wagon model. (TXF: "Drive")
- Martin Luther King, Jr. is assassinated in Tennessee. (TXF: "Musings of a Cigarette Smoking Man")