Saved by the Bell is an American television teen sitcom created by Sam Bobrick for NBC. The series premiered, in prime time, on August 20, 1989, a Sunday night. Targeted at kids and teens, Saved by the Bell was broadcast in the United States on Saturday mornings, later as the flagship series in NBC's TNBC lineup. A reboot of the Disney Channel series Good Morning, Miss Bliss, the show follows a group of high school friends and their principal at the fictional Bayside High School in Los Angeles. Primarily focusing on lighthearted comedic situations, it occasionally touches on serious social issues, such as drug use, driving under the influence, homelessness, remarriage, death, women's rights, and environmental issues. The series starred Mark-Paul Gosselaar, Dustin Diamond, Lark Voorhies, Dennis Haskins, Tiffani-Amber Thiessen, Elizabeth Berkley, and Mario Lopez. The series ran for four seasons, airing its final episode, again in prime time, on May 22, 1993, a Saturday night.