Castle Party Massacre is the fourth episode in the Disenchantment series. It premiered on August 17, 2018.
- Abbi Jacobson as Princess Bean
- Eric Andre as Luci / Bean's One-Night Stand / Pendergast / Man Who Doesn't Want to Dance
- Nat Faxon as Elfo / Viking
- John DiMaggio as King Zøg
- Tress MacNeille as Queen Oona / Server Boy / The Fairy
- David Herman as The Herald / Bean's One-Night Stand / Chazz
- Maurice LaMarche as Odval / Scribe / Sven
- Lucy Montgomery as Bunty
- Billy West as Sorcerio / Jester
- Jeny Batten as (voice)
- Rich Fulcher as (voice)
- Robin Atkin Downes as (voice)
- Unnamed plumber (trapdoor)
- Unnamed neighbour (flaming arrow)
- Sven and 6 other Land Vikings (trapdoor)
- Unknown number of party guests, including giants and gnomes (swords and arrows)
- The Fountain is shown to be filthy and the cause of Zog's illness; it is called back to later with the Land Vikings.
- Three fairies (including the Hooker Fairy) are seen smoking in a back alley. They light up the sky with the sign "Party at Dreamland".
- At the party are seen:
- a crowd-surfing gnome.
- a gnome sat on an ogres shoulder.
- a male and female ogre dancing.
- The Village People: the band composed of Knights Pendergast , Turbish and Mertz is called The Pillage People.
- Coachella: Bean hopes the band get to play at Cornchella.
- Corn exchange: (English) is a building where merchants traded corns. Such trade was common in towns and cities across England until the 19th century.
- Rodeos: King Zog mentions them but he doesn't know what they are.
- Eyes Wide Shut (1999): the secret society sex party (held by the Seekers) is a thinly veiled reference to this film.
- Bread mould is a possible reference to ergot, a fungus which grows on rye and which has been linked to witchcraft and St Anthony's Fire (or ergotism) in the Middle Ages as far back as the 12th century. Ergotised bread produced powerful hallucinations as well as convulsions, gangrene and death.
- Secret societies featuring the occult and religious sex magic rituals are a common theme in fantasy tales.
- The castle is located at 1, Castle Drive.
- The presence of gnomes and ogres at the party means they didn't all die in the Battle of Episode 1. Some were slain at the party however.
- Bean: Stay as long as you can, even if it takes the whole weekend. People rarely recover before Saturday night.
- King Zog: Okay... But there better not be any funny business while I'm gone...
- Jester: You can count on me sire!
- Bean: Welcome back to your castle father, where nothing unusual occurred.
- Odval: Certainly no religious sex magic rituals...
- King Zog: Glad to hear it.
- King Zog: [sees the dead corpses Bean tried to dispose off] [yelling] BEEEEEEEEEEEEEEEEEEEEEEEEAAAAAAAAAAAAAAAAAAAAAAAAAAAANNNNN!!!!!!!!!!!!!!!