The Invisible Monster (S01E20)

S01E01 Premiere S01E01 The Mystery of the Lizard Men S01E02 Meet the Competition S01E02 Arctic Splashdown S01E03 Just Desserts S01E03 The Curse of Anubis S01E04 Pursuit of the Po-Ho S01E04 Decisions, Decisions S01E05 Riddle of the Gold S01E05 Rock and Roll S01E06 Treasure of the Temple S01E06 Red, White and Clue S01E07 Calcutta Adventure S01E07 The Rise and Fall S01E08 The Robot Spy S01E08 Fight Until the Batter End S01E09 Double Danger S01E09 Finale S01E10 Shadow of the Condor S01E11 Skull and Double Crossbones S01E12 The Dreadful Doll S01E13 A Small Matter of Pygmies S01E14 Dragons of Ashida S01E15 Turu the Terrible S01E16 The Fraudulent Volcano S01E17 Werewolf of the Timberland S01E18 Pirates from Below S01E19 Attack of the Tree People S01E20 The Invisible Monster S01E21 The Devil's Tower S01E22 The Quetong Missile Mystery S01E23 The House of Seven Gargoyles S01E24 Terror Island S01E25 Monster in the Monastery S01E26 The Sea Haunt