"Monster Swamp" is the fourth episode of the supernatural drama television series Preacher, which originally aired on AMC in the United States on June 19, 2016.

He later converts atheist Odin Quincannon (Jackie Earle Haley) to Christianity, using his power in front of the entire congregation to achieve that goal.

Angry at the death of a woman, Tulip (Ruth Negga) carries out a form of vigilante justice, but the consequences are not expected as she mistakenly throws Cassidy out of a window, only to discover him to be an immortal vampire.

Meanwhile, Cassidy (Joseph Gilgun) tries to tell Jesse about Fiore (Tom Brooke) and DeBlanc (Anatol Yusef) and warns him to flee Annville; his advice falls on deaf ears.

Jesse visits Emily (Lucy Griffiths) to suggest raffling off a flat-screen TV to attract more people to church and alludes to a scheme that will boost attendance.

Miles gives Quincannon a Green Acre brochure and suggests he consider a partnership, given that local tax revenues have decreased 58 percent in 10 years.

[12] It also adapts, or at least provides allusions to Jesse's father John Custer from Until the End of the World, in the form of various flashback sequences, as well as from Salvation with Odin Quincannon.

They're going to be the two powers in this town [...]"[3] Goodman notes that the choice of both men building the Alamo was very purposeful, "It's the definition of Texas lore, but it's also an unwinnable battle, and their recreating it.

[20] Showrunner Sam Catlin was interviewed for the segment, and stated "Cassidy's sort of figured out that DeBlanc and Fiore aren't vampire vigilantes.

"[20] In an interview with AMC, Anatol Yusef, who portrays DeBlanc, spoke of Cassidy in which he remarks, "I think he's slowly figuring out that we might be idiots, cos' we give him anything he needs.

"[21] Dominic Cooper concludes the "Inside Preacher: Monster Swamp" featurette by discussing Jesse's confidence in employing his ability upon Quincannon, "He would never risk losing the church to this man if he wasn't fully convince that this power worked.

[27] The names of actors Graham McTavish, Derek Wilson and Ian Colletti are featured in the opening title sequence, though they don't appear in the episode.

[31] Winant briefly mentions the layout of that particular scene whilst filming, to which he states, "Cassidy's coming out the window, and revealing Tulip looking down at him.

"[31] Joseph Gilgun was interviewed for the "Monster Swamp" segment and spoke of the creation of the window sequence, which primarily involved practical prosthetics.

Then we hook this up to our pressure spot [...]"[31][32] Ruth Negga spoke of her combat preparation for the scene with Cassidy, wherein she states, "I've been training with John Koyama, who's our stunt master, and he's been teaching me how to use a baton lethally.

I'm using actually a rubber prop [...]"[31] "Monster Swamp" editor Tyler Cook spoke of Zisk's direction of the episode, particularly praising his choice for his wide shots, to which continued by saying, "The Alamo is a stand-in for Annville and here are these two imposing figures who are literally standing over the town [...] Especially that high birds eye view at the very end where you just watch them go back to their work and it's like yeah they are planning the future of this town together and apart and how are those going to intersect?

"[3] With Sara Goodman finishing it off by making the remark of "I think [Zisk] did an incredible job in terms of visually [...] giving us the horror trope and at the same time letting us see the town and where the value system is or isn't.

[35][36] Prior to Preacher's public release, AMC provided the first four episodes of the season 1 for review, only available to critics, which included "Pilot", "See", "The Possibilities" and "Monster Swamp".

[40] On June 13, 2016, AMC promoted the following of the Preacher magazine on Flipboard, where the latest in full episodes, sneak peeks, behind the scenes moments, exclusive cast interviews can be accessed through a mobile device.

[43] On June 18, 2016, Negga, in an interview with Revelist's Shaunna Murphy, expressed her criticism of company Funko who left out co-main character Tulip O'Hare in their Preacher Funko Pop vinyl figures that were recently unveiled to which the company included the lineup of Jesse, Cassidy, and B-character Eugene;[44][45] with Negga herself stating, "It’s so narrow-minded ... but also, are they mental?"

[47] During the final church scene, with Jesse and Quincannon, Dave Porter includes a distinct music element, which was the Heisenberg cue from Breaking Bad.

"[51] Eric Goldman of IGN reacted positively to "Monster Swamp", remarking that: "The fourth episode of Preacher began to bring Odin into the main storyline in a bigger way, helping to better solidify his role in the series.

Right now, a lot of the odd events and offbeat characters are existing in their own scenarios that sometimes cross over, but as the season continues, it feels like more and more overlapping will begin to occur.

"[52] Darren Franich of Entertainment Weekly heralded "Monster Swamp" by remarking: "Preacher the TV show has very gradually moved these characters together -- and it's interesting to consider what these two devils (Odin & Cassidy) might do to their mutual friend Jesse Custer.

"[48] Alan Sepinwall of HitFix praised the piece by stating, "Overall, it's a more successful than last week's episode was at trying to pivot from the entertaining incoherence of the first two installments into something more sustainable as a narrative.

"[53] Mark Rozeman, for Paste Magazine, wrote, ""Monster Swamp" provides yet another grounded Preacher entry, albeit one that looks to more clearly push (however intermittently) both the characters and plot forward to the next level.

[56] Scott Meslow of Vulture, gave "Monster Swamp" a three-star rating and said: "Preacher doesn't hesitate to remind us that Annville, Texas, is a wretched, miserable place, but the limits of its depravity remain an open question.

"[57] Kimber Myers of The Playlist highly praised "Monster Swmp", commenting that "Other than its bonkers, WTF first minutes and a requisite crazy scene with vampire Cassidy, episode four of Preacher is its quietest yet.

"[58] Kevin Yeoman of ScreenRant criticized the episode in his review, writing, "Like the hours before it, "Monster Swamp" is loaded with memorable moments that serve the characters but not necessarily the plot."

"[59] SFX Magazine's Anthony John Agnello remarked that, "Monster Swamp doesn’t fix Preacher’s Jesse Custer problem, nor does it actually establish a coherent core plot."