THE HORMONAL CONVERSION; Dr. Gibson's mentor (Tracey Ullman) pays another visit, revealing that she is now a man named Hans after a sex change operation. WHO IS HE?; Henpecked, New York doorman Jimmy (special guest star John Ashton), returning home from work, asks a depressed girl (Tracey Ullman) outside his apartment building who is the boyfriend that dumped her. FACE THE MUSIC; Chorus dancer Andy (Joe Malone) asks Miss Alexander (Tracey Ullman), the veteran lead dancer in the play he is in, to dance with him backstage in a nostalgic dance sequence.