| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | The Paul Revere Mystery |
September 6, 1998
Nickelodeon
|
25 | |
| S04E02 | The Spare Parts Mystery |
September 13, 1998
Nickelodeon
|
25 | |
| S04E03 | The Skin Deep Mystery |
September 20, 1998
Nickelodeon
|
25 | |
| S04E04 | The Itchy Shorts Mystery |
September 27, 1998
Nickelodeon
|
25 | |
| S04E05 | The Robot Mystery |
October 4, 1998
Nickelodeon
|
25 | |
| S04E06 | The Art Attack Mystery |
October 11, 1998
Nickelodeon
|
25 | |
| S04E07 | The Baseball Fan Mystery |
October 13, 1998
Nickelodeon
|
25 | |
| S04E08 | The Yearbook Mystery |
October 18, 1998
Nickelodeon
|
25 | |
| S04E09 | The UFO Mystery |
October 20, 1998
Nickelodeon
|
25 | |
| S04E10 | The Haunted House Mystery |
October 25, 1998
Nickelodeon
|
25 | |
| S04E11 | The Moon Rock Mystery |
November 1, 1998
Nickelodeon
|
25 | |
| S04E12 | The Egg Mystery |
November 8, 1998
Nickelodeon
|
25 | |
| S04E13 | The Jinxed Campaign Mystery |
November 15, 1998
Nickelodeon
|
25 | |
| S04E14 | The Movie Star Mystery |
November 22, 1998
Nickelodeon
|
25 | |
| S04E15 | The Racetrack Mystery |
November 29, 1998
Nickelodeon
|
25 | |
| S04E16 | The Toy Store Mystery |
December 6, 1998
Nickelodeon
|
25 | |
| S04E17 | The Mystery Under Our Noses |
December 13, 1998
Nickelodeon
|
25 | |
| S04E18 | The Mystery of The Mice That Roared |
December 20, 1998
Nickelodeon
|
25 | |
| S04E19 | The Train Mystery |
December 27, 1998
Nickelodeon
|
25 | |
| S04E20 |
The Big Cheese Mystery
series finale
|
January 3, 1999
Nickelodeon
|
25 |
No artwork of this type.
No artwork of this type.
No artwork of this type.