|This article contains canon information corresponding to the Tales of Arcadia franchise. That means all information in this article is true and has appeared/been validated officialy on-screen.|
A giant troll wreaks havoc at the school science fair, threatening to expose both the troll world--and the royals true identities.
- Tatiana Maslany as Aja Tarron
- Diego Luna as Krel Tarron
- Nick Offerman as Varvatos Vex
- Glenn Close as Mothership
- Ike Amadi as Detective Scott
- Kelsey Grammer as Blinky
- Cheryl Hines as Momblank
- Emile Hirsch as Jim Lake Jr.
- Tom Kenny as Dadblank/Officer Brennan
- Lexi Medrano as Claire Nuñez
- Laraine Newman as Miss Janeth
- Cole Sand as Eli Pepperjack
- Charlie Saxton as Toby Domzalski
- Fred Tatasciore as AAARRRGGHH!!!
- Lauren Tom as Mary Wang
- Frank Welker as Luug
- Thomas F. Wilson as Coach Lawrence
- Bebe Wood as Shannon
- Steven Yeun as Steve Palchuk
- This is the first episode of 3Below to feature the main cast of Trollhunters together (Jim, Toby, Claire, Blinky, and AAARRRGGHH!!!)
- At the conclusion of this episode, Aja is heard saying terms such as 'awesomesauce' which are associated with Trollhunters. This is possible to be an aftereffect that outlasts the time 'reset'. The full extent of this is yet to be clear.
- Goof: This episode cannot logically take place during the Trollhunters Part Three timeline because both Claire and AAARRRGGHH!!! are present, even though when Claire was no longer possessed by Morgana, AAARRRGGHH!!! was taken captive by Gunmar.
- Plausibility: However, it could be most likely that it takes place shortly before "So I'm Dating a Sorceress", as (if viewed closely) Claire's eyes look red from sickness, but is effectively getting better.
- The episode's title is in reference to the French term "Déjà vu" (translation: "Already seen"), describing the feeling that one has lived through the present situation before.
- Running Gag: Shannon's volcano always breaks when she runs into someone (Aja, Porgon, Toby, and Steve).
- The song that continuously plays on Aja and Jim's alarm clocks is "Easy Peasy" by The Kinnardlys.
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