While exploring some futuristic ruins, Susan sees glimpses of a familiar girl.
- Martin (flashback)
- Minerva (debut; flashback)
- Humans (flashback)
- The Widow (cameo)
- The Widow's Bodyguard (cameo)
- Susan has returned in this episode since "Whipple the Happy Dragon." Her actual first name is revealed to be Kara. She also used to have the ability to speak coherent English before she spoke in third person.
- During the Founder's Song, the footage of the humans colonizing the islands shows one of the blimps has MO Co. on its side.
- This episode was released for digital download and DVD on January 24, 2017.