episode with Kelly in a weird double-date at some
              restaurant?

Married... With Children was Fox's longest-running show. As such, they
have used it three times as a "launching pad" for attempted spinoffs:

    "Top of the Heap" (the episode that begins with Charlie Verducci
        throwing a cat out a window)

    "Radio Free Trumaine" (the episode about a college radio station).

    "Enemies" (the episode where Kelly is dating a guy who cheating on
    his girlfriend who is cheating on him with Alan Thicke)

These three are technically episodes of MWC, but focus mostly on the new
series' characters. In my opinion, they are better considered the first
episodes of the spinoffs.

The episode "Top Of The Heap" in the fifth season introduced the spinoff
"Top Of The Heap". Al Bundy appears in one scene, and also very briefly
at the end; other than that, no regular characters appear. The spinoff
lasted a short time, with several cameos by Bundys.

The episode "Radio Free Trumaine" in the ninth season introduced an
unnamed spinoff. All of the regular characters appear in the episode,
but only Bud, Marcy, and Steve Rhoades appear more than briefly. Fox
changed its mind about actually ordering and airing the spinoff, so
that's all there is of it, to the best of my knowledge.

The episode "Enemies" in the tenth season introduced "Enemies". All of
the regular characters appear in the episode, but only Kelly appears
more than briefly. There was talk of Fox airing the series _Enemies_
this season (1996-1997) but it didn't happen.