[Zensation]

I've been looking into redox cycling of organic compounds, and I'm a little confused.

If the redox potential of a molecule is -150mV, and it forms a radical anion upon reduction, then does the redox potential apply to the organic compounds which this molecule can transfer its electrons do? Or does it not, since radical species are "very reactive".

For instance, Zinc can reduce various quinones to form semiquinone radical anions, and these radical anions can go on to reduce oxygen to superoxide radical anion. Zinc is not able to reduce oxygen to superoxide on its own.... so is my inference about redox potentials not applying to radical species correct? Or do radicals just have very high redox potentials?