I am a major TV wonk having grown up in the forties and fifties when TV was all there was in life. Over the years I have noticed a pattern by writers that when they run out of material they will do a retrospective or go back in history episode. All of the great shows have done it and it strikes the death knell. I remember when Northern Exposure went to an episode about the founding of Cicely and how the two lesbians were the founders of the community. I loved Northern exposure and I loved all of the characters but to pull this bad story out of a hat and mess of a good record with it is terrible. The same with Community. Immediately when they had a retro episode I knew that the end was near. Check it out. I am right.