 Season one was met with generally favorable reviews, and currently holds a Metacritic score of 62 out of 100, based on 24 collected reviews.Season two was met with a more enthusiastic response, and holds a Metacritic score of 72 out 100, based on 9 collected reviews.The debut episode attracted controversy due to its plot line, which depicts the hypothesis that autism is caused by a mercury-based preservative formerly used in common childhood vaccines and treats the hypothesis as being credible and legally compelling.