"Return to the Nightosphere" was written and storyboarded by Ako Castuera and Jesse Moynihan, whereas "Daddy's Little Monster" was written and storyboarded by Rebecca Sugar and Cole Sanchez.
Martin Olson, the father of voice actress Olivia Olson, reprises his role as Hunson Abadeer in this episode, as well as "Daddy's Little Monster"; Olson had previously appeared in the second season premiere "It Came from the Nightosphere" and the third season episode "Memory of a Memory" [REF].