|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 officially on-screen.|
Terra Incognita Part One is the first episode of 3Below.
When their planet's monarchy is overthrown by a coup, royal alien teens Aja and Krel fleed to Earth accompanied by their brutish bodyguard.
- Tatiana Maslany as Aja Tarron/Queen Coranda
- Diego Luna as Krel Tarron
- Nick Offerman as Varvatos Vex
- Glenn Close as Mothership
- Alon Abutbul as General Morando
- Hayley Atwell as Zadra
- Andy Garcia as King Fialkov
- Jennifer Hale as Izita
- Chris Obi as Loth Saborian
- Cole Sand as Eli Pepperjack
- Frank Welker as Luug
- Goof: The episode shows the ship crash-land in Arcadia at dawn, whereas in the Trollhunters episode "Night Patroll", the ship is seen landing at night.
- Eli's voice becomes much deeper, starting with this episode (understandable, as his voice actor, Cole Sand, has further matured since starring in Trollhunters).
- This is lampshaded by Eli himself, as well as Steve Palchuk in the later episode "Party Crashers" when Eli implores Steve to "Listen to [Eli's] voice, Steve. I've matured. And mature people go into the woods and hunt the legendary Arcadian Billycraggle." Steve rebukes with "Hush your manly voice!" so that Eli doesn't blow their cover as Creepslayerz.
- Queen Coranda's first lines of the series "Smile and wave. Smile and wave." could be an allusion to the line "Just smile and wave, boys. Smile and wave." uttered by Skipper in the DreamWorks animated film Madagascar.
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