- Acting for Two: Roger Cross plays Joshua, Cade's Gua ally, and Cain, an evil Gua using an identical husk to Joshua's.
- Recycled Script: The plot of Second Wave is basically a combination of various episodes of The Twilight Zone (1959) episodes, including "The Monsters Are Due on Maple Street" and "The Shelter", with elements of "The Encounter" and "Nothing in the Dark".
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