A story that's fast-paced, and still somewhat nice. That being said, it has not aged well. Between the deus-ex-machina of Tegan speaking the exact language that Kurkutji spoke, and the slightly racist undertones, it probably wouldn't be made today, but it was a very nice story nonetheless. The resolution did feel a bit rushed, and it was a tad convenient that the Doctor happened to have the poison needed and Monarch happened to be at least partially organic. In all honesty, I enjoyed the character dynamics in at least the first and last TARDIS scenes. Overall, a story that's still nice to have, but maybe not one of the earliest to watch.