Actually, there is at least one Jimmy-free episode. "I've Got You Under My Skin", in large part because it is set entirely in one day and that happens to be Lois and Clark's day off, does not have Perry or Jimmy. Nor does it have M&J.
The honeymoon episode we get M&J (well, technically only historical equivalents), and Perry and Jimmy. "I've Got You Under My Skin" we get none of them.
