Board Thread:The Panopticon/@comment-1293767-20151029072618/@comment-24894325-20161209220542

What does "leads directly" exactly mean? Almost every serial of the classic series leads directly into the next serial, but we do not consider them one story. The Parting of the Ways leads directly into The Christmas Invasion by way of regeneration. Should we consider two-parters with no common Doctor among them?