[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".

: 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". [S15E18] Underworld 2

: The Doctor discovers troglodytes working in a nebula's core full of caves, overseen by men who use "fumigation" as a means of control. : Critics generally find Part Two to be

In this chapter of the four-part story, the Doctor and his companions explore a slave-labor mining society on a newly formed planet. : The Doctor discovers troglodytes working in a

: 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