Claim: John Constantine is a DC comics character.

The Swamp Thing is a fictional character in the DC Universe . He is a humanoid/plant elemental creature , created by writer Len Wein and artist Bernie Wrightson . Swamp Thing has had several humanoid or monster incarnations in various different storylines . He first appeared in House of Secrets # 92 -LRB- July 1971 -RRB- in a stand-alone horror story set in the early 20th century . The character then returned in a solo series , set in the contemporary world and in the general DC continuity . The character is a swamp monster that resembles an anthropomorphic mound of vegetable matter . He fights to protect his swamp home , the environment in general , and humanity from various supernatural or terrorist threats .   The character found perhaps his greatest popularity during the 1970s and early 1990s . Outside of an extensive comic book history , Swamp Thing has inspired two theatrical films , a live-action television series , and a five-part animated series , among other media . IGN ranked him 28th in the Top 100 Comic Book Heroes .