Sort / Filter : Viewed or not
How about adding a folder, like that of the HD Recordings or Recently Deleted, that contains everything you have on GREEN. Or everything that's a NEW episode until you watch it. And, um, put it at the top.
(2011) TiVo XL
(2007) TiVo HD --> 1TB
(2005) S2 --> 182hrs. (2006) --> 611hrs.