Penny Lane’s documentary—comprising archival material, animated sequences, and the occasional talking head—blooms into an incredible almanac of early twentieth-century quackery and innovation as she focuses on J. R. Brinkley, an early broadcasting baron, direct-mail pioneer, and an evangelical proponent of goat-testicle implants. An empire built on spurious claims and fear-mongering seems unstoppable—until an obscure regional newspaper dares to question its foundations.