What I found notable in this one was the first instances of those fundamental Who tropes "human greed endangers the entire Earth" and "dedicated but misguided scientist, who may or may not come good in the end"
'The fact growing Barbara back to normal size cures her of poisoning makes no sense, really, but this is the wrong story to look for sense in.'
I think it's one of the best pieces of 'Oh, that makes perfect sense' resolution. The poison was never shrunk, so when she grows back, it remains the same, and she now has like 5% of a lethal dose in her system, instead of 100%
What I found notable in this one was the first instances of those fundamental Who tropes "human greed endangers the entire Earth" and "dedicated but misguided scientist, who may or may not come good in the end"
'The fact growing Barbara back to normal size cures her of poisoning makes no sense, really, but this is the wrong story to look for sense in.'
I think it's one of the best pieces of 'Oh, that makes perfect sense' resolution. The poison was never shrunk, so when she grows back, it remains the same, and she now has like 5% of a lethal dose in her system, instead of 100%