11 seasons across 65 episodes so far, still running.
Created as a mystery, police and crime drama spin-off of Masterpiece Theatre; from 1980 to 2007, Mystery! aired mostly British crime series purchased from or co-produced with the BBC or ITV and adapted from British mystery fiction. In 2002, due to pressure to include more American material, a series based on the novels of US mystery writer Tony Hillerman was produced, but the vast majority of Mystery! programming has always been and continues to be British literary adaptations co-produced with UK-based production companies. In 2008, PBS combined Mystery! with Masterpiece Theatre under the umbrella title Masterpiece, which includes the sub-brands Masterpiece Classic, Masterpiece Mystery!, and Masterpiece Contemporary.
| 1 | Season 1 | 14 ep1980 |
| 2 | Season 2 | 20 ep1981 |
| 3 | Season 3 | 31 ep1982 |
| 4 | Season 4 | 19 ep1984 |
| 5 | Season 5 | 33 ep1984 |
| 6 | Season 6 | 32 ep1985 |
| 7 | Season 7 | |
| 8 | Season 8 | |
| 9 | Season 9 | |
| 10 | Season 10 | |
| 11 | Season 11 |
