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| PERFORMER | Frank Oz |
| DEBUT | 1980 |
Boo Mortmorkson is one of the participants in the Dwight D. Eisenhower Memorial Cross Country Billiards event in the Muppet Sports sketch in The Muppet Show episode 524. He's referred to by Louis Kazagger as a "Swedish hopeful" and his sole utterance is a repeated, gutteral sort of wildlife call.