Mother, the AI controlling the royals' ship, reflects on keeping the peace between her quarreling family. Morando discovers a secret hidden on Earth.
- Tatiana Maslany as Aja Tarron
- Diego Luna as Krel Tarron
- Nick Offerman as Varvatos Vex
- Nick Frost as Stuart
- Glenn Close as Mothership
- Alon Abutbul as General Morando
- Uzo Aduba as Colonel Kubritz
- Hayley Atwell as Zadra
- Guillermo Del Toro as Dr. Muelas
- Cheryl Hines as Momblank
- Tom Kenny as Dadblank
- Oscar Nuñez as Sergeant Costas
- Chris Obi as Loth Saborian
- Charlie Saxton as Toby Domzalski
- Fred Tatasciore as AAARRRGGHH!!!
- Danny Trejo as Tronos
- Frank Welker as Luug
- Jimmie Wood as NotEnrique
- The Mothership is the narrator throughout the episode.
- Colonel Kubritz learns that Aja and Krel are aliens in this episode.
- She also strikes an alliance with alien bounty hunter, Tronos.
- Krel comes up with an idea to connect Akiridion-5 and Earth with a wormhole generator.
- Zadra begins to forgive Vex in this episode.
- It is discovered in this episode that Gaylen's Core is hidden on Earth.
- Morando even theorizes that this is the true reason why the Mothership brought Aja and Krel to Earth.
- The main events of this episode take place one week after the events of "Moonlight Run".
- Toby refers to the time he, Jim, Claire, Aja, and Krel captured lightning in a bottle from the episode of the same name.
- According to Mother (up to this episode), it's been 42 days (or delsons) since the events of "Terra Incognita Part One", which is when the trio first crash-landed in Arcadia.
- This is the first (and only) episode in Part Two of 3Below where Eli Pepperjack is absent.
- Morando discovers that Loth Saborian has betrayed him by aiding the Resistance and the royals, and has him arrested.
- AAARRRGGHH!!! meets Aja and Krel for the first time (outside of the episode "D'aja Vu").
- The serene music played when Mothership is narrating at the beginning and end of the episode, as well as credits, is "For Absent Family" by Jeff Danna.
- Stricklander and Barbara Lake make brief, non-speaking appearances in this episode. They are seen caring for the freed changeling familiar babies in Jim's old bedroom at the Lake House.
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