One Class to rule them all, and in the darkness bind them.
The "God Class" problem is described on page 32 of Arthur Riel's excellent "ObjectOrientedDesignHeuristics". A "God Class" is an object that controls way too many other objects in the system and has grown beyond all logic to become The Class That Does Everything.
It is a form of the MediatorPattern, misapplied.
Synonym: AcmePattern
See also: