2. MAISON DU MYSTÈRE, LE (1923)
3. MAN OF MIGHT (1919)
4. MAN WHO DISAPPEARED, THE (1914)
5. MAN WITH THE STEEL WHIP (1954)
6. MAN WITHOUT A FACE, THE (1928)
7. MANDRAKE, THE MAGICIAN (1939)
8. MANDRIN (1924)
9. MANHUNT OF MYSTERY ISLAND (1945)
10. MANSION OF MYSTERY, THE (1927)
11. MARK OF THE FROG (1928)
12. MARTINO, IL TROVATELLO (1919)
13. MARTIRE! (1917)
14. MASCAMOR (1918)
15. MASKED MARVEL, THE (1943)
16. MASKED MENACE, THE (1927)
17. MASKED RIDER, THE (1919)
18. MASTER KEY, THE (1914)
19. MASTER KEY, THE (1945)
20. MASTER MYSTERY, THE (1918)
21. MASTERS OF VENUS (1962)
22. MATHIAS SANDORF (1921)
23. MEDICO DELLE PAZZE, IL (1919)
24. MEFISTO (1918)
25. MELTING MILLIONS (1927)
26. MEPHISTO (1930)
27. MIDNIGHT MAN, THE (1919)
28. MILIONI DI FRISETTE, I (1919)
29. MILLION DOLLAR MYSTERY, THE (1914)
30. MIRACLE RIDER, THE (1935)
31. MIRACLES OF THE JUNGLE (1921)
32. MISÉRABLES, LES (1912)
33. MISÉRABLES, LES (1925)
34. MISÉRABLES, LES (1934)
35. MISS MEND (1926)
36. MISTERIOS DE BARCELONA, LOS (1915)
37. MISTERO DEI MONTFLEURY, IL (1918)
38. MISTERO DELLA MANO, IL (1921)
39. MISTERO DELLO SCAFANDRO GRIGIO, IL (1920)
40. MISTERO DI ROCCABRUNA, IL (1921)
41. MONJE LOCO, EL (1940)
42. MONSTER AND THE APE, THE (1945)
43. MONTE-CRISTO (1929)
44. MOON RIDERS, THE (1920)
45. MORT DES PIRATES, LA (1918)
46. MORT QUI TUE, LE (1913)
47. MORTE ROSSA, LA (1918)
48. MYLORD L'ARSOUILLE (1925)
49. MYSTÈRE DE LA TOUR EIFFEL, LE (1927)
50. MYSTÈRES DE PARIS, LES (1922)
51. MYSTERIES OF MYRA, THE (1916)
52. Mysteries of the Grand Hotel #1 The Strangler's Cord (1915)
53. MYSTERIOUS AIRMAN, THE (1928)
54. MYSTERIOUS DOCTOR SATAN (1940)
55. MYSTERIOUS ISLAND (1951)
56. MYSTERIOUS MR. M, THE (1946)
57. MYSTERIOUS PEARL, THE (1921)
58. MYSTERIOUS PILOT, THE (1937)
59. MYSTERY BOX, THE (1925)
60. MYSTERY IN THE MINE (1959)
61. MYSTERY MIND, THE (1920)
62. MYSTERY MOUNTAIN (1934)
63. MYSTERY OF 13, THE (1919)
64. MYSTERY OF THE CORNER HOUSE (1913)
65. MYSTERY OF THE DOUBLE CROSS, THE (1917)
66. MYSTERY OF THE RIVER BOAT (1944)
67. MYSTERY PILOT (1926)
68. MYSTERY RIDER, THE (1928)
69. MYSTERY SHIP, THE (1917)
70. MYSTERY SQUADRON (1933)
71. MYSTERY TROOPER, THE (1931)
