The Atlas crew race to stop Honerva, who uses her own mech to search for the reality where she can live happily with her family. Using the dark creatures, Honerva takes control of the Alteans aboard the Atlas, and uses them to siphon and channel the energy from the Castle of Lions crystal that powers the Atlas. Merla, one of the Robeast pilots, is horrified at Honerva's willingness to sacrifice her fellow Alteans, and turns against her. Lance is able to bring Allura back from her coma. Hunk arrives with a Balmera, but Honerva siphons its energy as well, allowing her to fuse her own mech with Lotor's Sincline.
This episode's title is a reference to one of the opening lines of Voltron: Defender of the Universe. Each episode began with Peter Cullen's narration, "From days of long ago, from uncharted regions of the universe...."