The United States is threatened by the Spider--a criminal menace so terrifying that even no one in the underworld dares to challenge him. It's time for Dick Tracy (in this incarnation, a DOJ investigator) to take action! After the Spider orders the sinister Dr. Moloch to perform mind-altering surgery on Dick Tracy's brother, Tracy will need all the help he can get to overcome the Spider's advanced technology, save his brother, and bring the Spider to justice. Fortunately for Dick Tracy (Ralph Byrd), his loyal pals Mike McGurk (Smiley Burnette), Gwen Andrews (Kay Hughes), and Junior (Lee Van Atta) are on the case with him. (1937 - Republic Pictures)