There's nothing "only" about being a girl.
— Sarah Jane Smith
The Doctor returns to Peladon, some fifty years after his first visit (The Curse of Peladon
). King Peladon's daughter, Queen Thalira, is now in charge, advised by the inevitable Evil Chancellor
, who promptly arrests the Doctor and Sarah Jane. Alpha Centauri, the effeminate octopoid from the last story, is now the Federation ambassador to Peladon, and clears the Doctor's name.
A spectral image of Aggeddor (the titular Monster, a sacred monster to Peladon) has been blamed for a number of deaths among the Trisilicate miners. The Doctor discovers that the spectral image is the work of a human engineer, Eckersley, who is working in cahoots with some renegade Ice Warriors to seize the Trisilicate deposits for a rival power bloc.
The Ice Warrior leader, Azaxyr, leads an attack on the throne room, but is killed along with his comrades when the Doctor turns Eckersley's heat ray on them. Eckersley takes the queen hostage, but the Doctor and the real Aggeddor hunt him down. Eckersley is killed, but so is Aggeddor.
The rival power bloc surrenders to the Federation and the Queen offers the Doctor the chancellorship, but the Doctor suggests Gebek, the miners' leader.
- Mind Rape: The refinery's security system.
- Continuity Cavalcade: There are numerous mentions to the previous Peladon story.
- Convenient Coma: The Doctor can put himself into a coma, to avoid being killed by the refinery's alarm.
- Enemy Mine: Ortron and Gebeck's striking miners after the Ice Warriors show up.
- Evil Chancellor
- Flat Earth Atheist: Vega Noxos (who belong to the Satyr alien race known as the vegan) He viewed the native Peladonian miners as "superstitious primitives" for their fear of Aggedor. Ironically he was killed by the fake ghost of Aggedor.
- Foreshadowing: Sarah Jane mentions the Doctor's saying, "Where there's life, there's hope," trailing off before the final word. Later, thinking him dead, she cries over his body. The Doctor, upon waking states, "Tears, Sarah?"
- Heel-Face Turn: Chancellor Ortron
- Hermaphrodite: Alpha Centauri makes a second appearance, and is once again said to be hermaphroditic, voiced by a woman, and referred to as "he".
- Hostage Situation: The Martians gather a group of Peladonians, plus the Doctor and Sarah Jane, and threaten to kill them if the miners refuse to work.
- Judge, Jury, and Executioner: The Martian commander drops the trope name. He doesn't actually get to be the third one.
- Les Collaborateurs: Eckersley conspires with the Ice Warriors for a stake in the trisilicate trade.
- The Mole: Eckersley.
- Multicolored Hair / Skunk Stripe: The miners' hair, which has alternating bands of white and brown.
- Presumably a genetic trait of the natives of Peladon, given that it's the same or similar with everyone else who's from the planet.
- Human Aliens
- Music Soothes the Savage Beast: Aggedor is still enthralled by Venusian lullabies.
- Public Secret Message: Gebek tells his miners to "cooperate with Commander Azaxyr like we've cooperated with Ortron". The catch being that they never liked Ortron and planned to overthrow him.
- Renegade Splinter Faction: Azaxyr and his crew are said to be members of an extremist Ice Warrior political group who are upset about their culture becoming good galactic citizens.
- The Revolution Will Not Be Vilified: Both averted and played straight; Gebeck's worker's rights movement is depicted sympathetically, but the attempts of Ettis to start an actual revolution are universally condemned.
- Ripped from the Headlines: This story was inspired by the 1972 miners' strike.
- Scooby-Doo Hoax
- Sequel Episode: To "The Curse of Peladon".
- Strongly Worded Letter: Alpha Centauri threatens to make their displeasure known by sending an official communication to the Galatic Federation. This is during the middle of an armed uprising against the government.
- Unobtainium: It's called Trisilicate.
- What's Up, King Dude?: It seems anyone, including miners, can walk into the throne room and talk to the queen whenever they want to talk to her about something.
- The X of Y
- Yellow Rocks - Trisilicate
- You Will Outlive Your Usefulness: The Ice Warriors kindly inform the Doctor that they intend to kill him as soon as he's no longer useful to them.