The plot of DeepStar Six involves a team of eleven scientists working for the US Navy is constructing a facility stationed six miles beneath the surface of the ocean for the launching of nuclear missiles. They discover they are building atop what appears to be a vast underground cavern. The Navy might scrap the project if they don't complete it before their six-month stint is up. Once they destroy the cavern, they discover that they aren't alone down there, as some strange and massive prehistoric arthropod creature begins to attack their undersea vehicles. Nancy Everhard, Greg Evigan, Miguel Ferrer, Taurean Blacque, Nia Peeples, and Matt McCoy star.

Erratum: Apologies to Harry Manfredini for calling him "Henry" in this episode.