WMG: The Red Church

The Bell Monster is responsible for the Flanderization and Seasonal Rot.

It has reality warping abilities that prevent time from moving forward as part of its goals. Only time is moving forward at the same time it isn't. This is what allows Springfielders to acknowledge past events despite never aging. The mass Flanderization is a side effect of people reliving existence continuously while moving forward. The one thing it has problems dealing with is death, thus why dead characters tend to remain dead.