If you mean a filmed, live-action episode... zero. They underdelivered for S2 because of the strike/budget problems (they were meant to deliver 26 episodes, like every other season, and only managed 22. Including "Shades of Gray"). If they'd filmed another episode, it would have gone out.
"Shades of Gray" was written to save time and money as a result of the writers' strike of 1988. It was shot in only three days, while most take at least a week. Director Rob Bowman commented, "It was Paramount saying, 'We gave you more money for "Elementary Dear Data" and the Borg show. Now do us a favor and give us a three-day show.' So that's what you do. It's an accepted part of the medium."