- Mysteries Unearthed With Danny Trejo
TV-PG | History/Travel
- Mistletoe Murders
TV-PG | Drama/Holiday
- Midsomer Murders
TV-PG | Crime drama/Mystery
- MysteryQuest
TV-PG | History/Documentary
- MonsterQuest
TV-PG | History/Documentary
- Matchmaker Mysteries
TV-PG | Mystery
- Mystery Island
TV-PG | Mystery
- Mysteries of the Unknown
TV-PG | Travel/Mystery
- Martha's Vineyard Mysteries
TV-PG | Mystery
- Murder and Justice: The Case of Martha Moxley
TV-PG | Documentary/Crime
- Mystery Science Theater 3000
TV-PG | Comedy/Science fiction
- Monsters and Mysteries in America
TV-PG | Mystery
- Murdoch Mysteries
TV-PG | Drama/Mystery
- The Moonstone
TV-PG | Drama/Miniseries
- Matlock
TV-PG | Drama/Mystery
- Mystery ER
TV-PG | Health/Medical
- Mr. Housekeeper
NR | Comedy/Drama
- Murder Before Evensong
NR | Crime/Mystery
- Mystery Theatre Special
NR | Mystery/Special
- Maigret on Masterpiece
NR | Crime/Mystery
- The Midwich Cuckoos
NR | Drama/Science fiction
- Missing
NR | Drama/Mystery
- Murder for Sale
NR | Mystery/Special
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