Dick is determined to keep Vernon Kyle from controlling the world's radium supply. Junior captures "The Purple Rider" and two of Vernon Kyle's henchmen. "The Purple Rider" escapes by jumping over a chasm on horseback. Dick Tracy proves himself quite a cowboy by following right after him and lassoing him out of the saddle. A meeting of "The Dick Tracy Secret Service Patrol" is held. Tomorrow will be, "The Dick Tracy Patrol Badge Day."