Intro To The Tommy Westphall Universe
Tommy Westphall comes from the 80s medical drama St Elsewhere. The final episode of St Elsewhere revealed that the entire show had been dreamt up by Tommy Westphall, the autistic son of Dr. Donald Westphall.
Because St. Elsewhere crossed over with several other shows, and those shows crossed over with other shows, a theory was created that all of these shows exist together within one universe, all made up in the mind of Tommy Westphall.