City on Fire (1979)
Shelley Winters, Leslie Nielsen, James Franciscus, Ava Gardner, and Henry Fonda all get their fingerprints on this disaster movie about a disgruntled employee who sets an oil refinery ablaze, causing a chain-reaction engulf the entire city with flames.
This film was originally featured on MST3K, during the KTMA Season. But unlike some films of that Season, it was no re-riffed later on the show. And I would very much like to see it given a proper riffing.