When it tried to pass off a clip show as an actual episode
It’s one thing to throw in a clip show as part of a regular season. With 22-24 episodes per, it’s acceptable to pass it off as the writers needing a break, or the viewers needing a refresher course, or whatever. What isn’t acceptable is to use a clip show as your goddam season finale. Shame on you, “Shades of Gray” (Jesus, even the title is gag-worthy).