The Tommy Westphall universe hypothesis
The Tommy Westphall universe hypothesis, an idea discussed among some television fans, makes the claim that not only does St. Elsewhere take place within Tommy’s mind, but so do numerous other television series which are directly and indirectly connected to St. Elsewhere through fictional crossovers and spin-offs.
Tommy Westphall – Wikipedia, the free encyclopedia
Also: Tommy Westphall’s Mind – A Multiverse Explored.