This was the best episode of Season Four, and a serious contender for the best episode of the entire series. I am an avid fan of this show, and I found that this episode encompassed all the ingredients for a wonderful 30 minutes of television (minus the commercials, of course).
Alan is finally going to be free of paying alimony to Judith, as she prepares to marry Herb. Herb's sister Myra is a bridesmaid, and does not get along well with Judith. This leads to Myra spending the night over at Charlie's house. For anyone who follows this show, the inevitable happens. Charlie and Myra share an intimate night together and Charlie ends up being Myra's date for Judith's wedding. Jake, Berta, Charlie and especially Alan are all in top form. The writing is marvelous. Alan's tirade when he leans into Charlie about how Charlie's sexual proclivities always end up 'biting him (Alan) in the ass' is perhaps the funniest scene in the series. A fantastic, perfect episode.