The one with the "oh no Warp engines are damaging subspace" plot.
I agree. That's a plot that I would like in my rebooted version, so we can swap.
I like the way you think. We could make a bizarro Trek with all the worst plots and episodes being immutably canon.
Spock's Brain would be the pilot episode.
Right now, in another reality, Spock's Brain is considered to be the best TOS episode and The City on The Edge of Forever is the worst.