The UFO Mystery (S04E09)

S04E01 The Paul Revere Mystery S04E02 The Spare Parts Mystery S04E03 The Skin Deep Mystery S04E05 The Robot Mystery S04E06 The Art Attack Mystery S04E07 The Baseball Fan Mystery S04E08 The Yearbook Mystery S04E09 The UFO Mystery S04E10 The Haunted House Mystery S04E11 The Moon Rock Mystery S04E12 The Egg Mystery S04E13 The Jinxed Campaign Mystery S04E14 The Movie Mystery S04E15 The Racetrack Mystery S04E16 The Toy Store Mystery S04E17 The Mystery Under Our Noses S04E18 The Mystery of The Mice That Roared S04E19 The Train Mystery S04E20 The Big Cheese Mystery