Josiah Zayner, a former NASA scientist turned bio-hacker, seeks to rid himself of ongoing physical ailments by replacing all the bacteria living inside of him with that of a donor's. This method involves, among other things, swallowing pills made of the donor's poop, and scrubbing himself "clean" with antibiotics. Zayner shrugs off his many detractors, claiming his dangerous self-treatment is worth it.