On Rotten Tomatoes, the series holds a 95% approval rating based on 38 reviews, with an average rating of 7.44/10. The website's critical consensus reads, "By leaning into the horror of it all, Swamp Thing swims deep into the trenches of this strange world and returns with a scary good TV show."[33] Metacritic, which uses a weighted average, assigned the series a score of 67 out of 100 based on reviews from 5 critics, indicating "generally favorable reviews".[34]