Big Iron should be watched before Blind Spot.
In Big Iron (which is also one of two second season episodes where April is absent), Michael brings up K.I.T.T.'s "new" Trajectory Guide, which was first seen being used in Blind Spot. But for some reason, NBC chose to hold it back until the end of May 1984; while the UK first saw the episode on ITV in February of that year.
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