Val's aunt Ginny brings the twins home, and decides to stay for awhile. Mack opens his own practice, and Peggy decides to work for him. Jill spies on Gary and orders invitations for her and Gary's wedding. David Lamb bursts into Jill's office and says she is a slut who gave him VD. The Health Dept. calls both Jill and Gary to say that they have been exposed to Syphilis. Jill makes her appointment right before Gary's and tells the doctor they're getting married. Gary overhears nurse ask Jill if she wants another prescription. Gary calls the doctor and says Jill wants another prescription, and he'd like the insurance transcript. He discovers it was for barbiturates, and was filled before Jill went to San Francisco. The doctor tells Gary that neither he nor Jill has an STD. Gary thinks it's strange that Jill didn't get VD from David, and tells Mack he thinks Val may be telling the truth.

Michael likes Ellen, a classmate, but she likes Johnny.Jill buys a wedding gown. Gary is arrested for breaking into Jill's apartment, but Jill tells the police to let him go because Gary just can't accept their breakup. Mac finds the forger, but she's comatose and dying in the hospital. Gary, the MacKenzies and Williams wonder why Jill had gotten barbiturates, and remember that Val hadn't had her prescription filled. Pat says if a barbiturate is mixed with alcohol, it will knock someone out. Mack and Gary go to see David Lamb, who admits to them that all he remembers is going to Jill's room, and then waking up the next day.