Arrowverse Wiki
Arrowverse Wiki

Alec Holland,[1] also known as Swamp Thing, is a swamp monster who resided somewhere south of Maine.


Original multiverse[]

According to John Constantine, Alec resides in a swamp. People would often try to contact Alec but would get through to Constantine instead.[1]

John later stated to the Legends that wherever the Swamp Thing lives, "Maine was a bit too far north" for him.[2]

Anti-Monitor Crisis[]

During the Anti-Monitor Crisis, Swamp Thing as well as everyone in the multiverse except for the seven Paragons, was killed in an antimatter wave by the Anti-Monitor on December 10, 2019,[3] only to be restored a month later, after the Paragons and the Spectre created a new universe.[4]

New multiverse[]

At some point, Alec contracted a plant-based infection similar to Pamela Isley's, turning him into "Swamp Thing".[5]


DC's Legends of Tomorrow[]

Season 4[]


Season 3[]

Behind the scenes[]

  • In the comics, Alec Holland was known as the Swamp Thing: a mutated humanoid plant creature who tasks himself with protecting The Green, an elemental force which connects all plant life on planet earth. He was often aided by John Constantine in the various occult circumstances they would come across.
  • Holland's first reference in the Arrowverse was a 2014 promotion for the NBC show Constantine.[1] The "phone number" of John Constantine was given out, and when called, the answer message from John stating "Hello, you've reached John Constantine. And that's John Constantine. If you're looking for Alec Holland, try the bloody swamp." A reference to Holland, and his role as the Swamp Thing. Due to this being a promotion, the reference is of uncertain canonicity.
  • The first direct on-screen reference to Swamp Thing occurs in the DC's Legends of Tomorrow episode "Wet Hot American Bummer" in which John Constantine mentions having met a "swamp thing" before. The episode also spoofs the Swamp Thing concept (in particular its movie and TV adaptations) by referencing a movie franchise titled Swamp Thaaaang.
  • Alec Holland/Swamp Thing has a doppelganger on Earth-19 in the new multiverse.