Saturday Night Live aired its fifth season during the 1979 - 1980 television season on NBC. John Belushi and Dan Aykroyd left the show at the end of the fourth season and they left a hole of cast members to fill in the fifth season. By the end of the season, the original cast, and executive producer, Lorne Michaels were ready to leave. While Saturday Night Live was ready to end, NBC wasn't ready for it to end. NBC wanted a sixth season with a brand new cast. The fifth season started on October 13, 1979 and ended on May 24, 1980.