This Week in TV is a weekly feature reviewing the best, worst and most interesting episodes of television from the past seven days. The plan is to cover a wide variety of shows, but not always the same ones each week, so let us know in the comments which ones you’d particularly like to read about. This week sees Barry Allen travel back in time to save his mother in the Flash finale; our review of CBS’ leaked Supergirl pilot; and David Letterman’s final appearance as host of the Late Show.
