Oooh this one is really cool! The premise might seem a bit basic but it really hooked me, we've got a space colony where everyone's lives are very tightly controlled, but that tries to maintain the illusion of happiness. A man named Medok has uncovered a conspiracy to hide the existence of these giant crabs called Macra, and the Doctor wants to help him pursue it.

The whole thing's really engrossing! I particularly liked the plot point where companion Ben is subjected to brainwashing and slowly works his way out of it throughout the course of the story. The animation, while still kinda lacking in character acting, helped sell the scale of the story really well, with bigger sets and bigger monsters. This is just a standard Doctor Who story done well enough to elevate it to absolute classic territory for me, one of my favorites alongside The Mind Robber and The War Games.

Another note is that this was the first story that was actually written with Jamie as a consistent cast member in mind, as the previous two scripts kind of had to awkwardly stuff him in at the last minute; it's nice to see him doing more, with a particular highlight being the scene where he gets mistaken for a dancer and escapes by doing a dance called the "Highland Fling," where at the end of the dance, you fling yourself out of the room.