[s15e18] Underworld 2 [QUICK | 2026]

: The Doctor discovers troglodytes working in a nebula's core full of caves, overseen by men who use "fumigation" as a means of control.

: You can find this classic episode on streaming platforms like Apple TV or Tubi .

In this chapter of the four-part story, the Doctor and his companions explore a slave-labor mining society on a newly formed planet. [S15E18] Underworld 2

: Critics generally find Part Two to be the weakest segment, describing it as "extremely dull" with roughly 20 minutes of "walking around and gas".

: The story is loosely based on the Greek legend of Jason and the Argonauts , specifically their quest for the Golden Fleece, with "Underworld" serving as a sci-fi retelling of the journey to Colchis. Critical Reception & Production : The Doctor discovers troglodytes working in a

: This serial is notorious for its heavy use of Color Space Overlay (CSO) , a primitive green-screen technique, to create the cave settings. Reviewers from IMDb note that while the lasers and some CSO effects work, others look "simply awful".

Reports on the episode's quality are mixed, often highlighting the ambitious story vs. the limited production budget of the time: : Critics generally find Part Two to be

: The society is controlled by "The Seers," who value radioactive energy over human life.