Roger Bacon (Boy), Joey Tata (Doc), Ray Didsbury (Crewman)
When Chip Morton turns the periscope over to Crane, the music makes us expect to see something out of the ordinary, and we see ... a nice clear ocean view. The surface is supposed to be covered with thousands of dead fish, but try to find any.
Werner Klemperer also appeared in the premiere, "Eleven Days to Zero," and "The Saboteur".
Sheila Allen is listed in the end- credits for this episode as Sheila Matthews. She later wed Voyage creator and executive producer Irwin Allen.