#43 Madam Secretary (CBS)
The political thriller starring Téa Leoni officially ended its six-season run in December. While it remains unclear why CBS canceled the Barbara Hall-created series, the show suffered from declining viewership numbers prior to its cancellation. According to TV Line, Madam Secretary wrapped Season 5 with a 0.4 rating in the 18-49 demographic and 4.8 million total viewers. Though it managed to keep its demo from Season 4, the number of viewers that tuned in for Season 5 was the show’s second-smallest audience ever.