Saved by the Bell is an American television sitcom created by Sam Bobrick for NBC. It was broadcast from August 20, 1989 to May 22, 1993. A retooling of the Disney Channel series Good Morning, Miss Bliss, the show follows a group of high school friends and their principal. 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. Targeted at kids and teens, Saved by the Bell was broadcast in the United States on Saturday mornings.