|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.|
The Eternal Night covers Arcadia in shadow, leading to a long-awaited showdown between Gunmar and the newly transformed Trollhunter."
It's the end of the school year, and it's time for the Battle of the Bands, but at a very bad time; the Eternal Night has begun, which means that Arcadia will have to know the truth about their town. Now that the war has begun, the Trollhunters and their allies must unite to save the entire universe.
- Emile Hirsch as Jim Lake Jr.
- Lexi Medrano as Claire Nuñez
- Charlie Saxton as Toby Domzalski
- Kelsey Grammer as Blinky Galandrigal
- Fred Tatasciore as AAARRRGGHH!!!
- Jonathan Hyde as Stricklander
- Lauren Tom as Nomura
- Amy Landecker as Barbara Lake
- Cole Sand as Eli Pepperjack
- Steven Yeun as Steve Palchuk
- Mark Hamill as Dictatious Galadrigal
- Ike Amadi as Angor Rot
- Clancy Brown as Gunmar
- Lena Headey as Morgana
- David Bradley as Merlin
- Jimmie Wood as NotEnrique
- Rodrigo Blaas as Gnome Chompsky
- Tatiana Maslany as Princess Aja
- Diego Luna as Prince Krel
- Thomas F. Wilson as Coach Lawrence
- Fred Tatasciore as Señor Uhl
- Laraine Newman as Lenora Janeth
- Tom Kenny as Javier Nuñez
- Andrea Navedo as Ophelia Nuñez
- Laraine Newman as Nana
- Lauren Tom as Mary Wang
- Yara Shahidi as Darci Scott
- Colin O'Donoghue as Douxie "Big D"
- Ike Amadi as Detective Scott
- This is the second two-part episode, after the series premiere.
- Everyone in Arcadia finally finds out about the world of Trolls.