The Simpsons (1989): Season 18, Episode 9

18 - 9: Kill Gil (Parts I & II)

During a holiday ice skating show starring guest voice Elvis Stojko, Homer jumps into a chaotic brawl involving the other ice skaters. In order to escape the chaos, Marge decides to take the family holiday shopping. Gil, dressed as Santa Claus, unknowingly gives Lisa a sold-out Malibu Stacy doll that belongs to his boss' daughter. When Gil loses his job, the Simpsons invite him over for Christmas dinner, which becomes a huge mistake as Gil moves in uninvited and mooches off the Simpsons. Out of guilt, Marge continually allows Gil to prolong his stay, but when her patience wears thin, she's forced to overcome her fear and finally say 'no'. Blackboard: 'Frankincense is not a monster'.