Big Finish Doctor Who/Recap/020 Loups Garoux

The Fifth Doctor and Turlough visit Brazil in 2080--decades after the Amazon has turned to desert. But not everyone in Rio is dying a slow, lingering death brought about by environmental and economic collapse: impossibly wealthy Ileana de Santos and her invalid son are taking a luxurious private train towards their family's private compound. They're accompanied by the Doctor--towards whom Ileana has conceived a one-sided and rather desperate attraction--and Turlough, and stalked by Rosa, last remnant of an extinct Amazonian tribe.

Tropes

 * Crapsack World: Near-future Brazil.
 * Ill Girl: An unusual gender flip with Ileana's son, an Ill Guy.
 * It's Always Mardi Gras in New Orleans: They're in Brazil. Will it be Carnival season? Three guesses, first two don't count.
 * Magical Native American: Rosa
 * Morally-Ambiguous Doctorate: Dr. Hayashi.
 * Last of Her Kind: Rosa
 * Wolfpeople