| Sketch | Nerds Science Fair |
| Steve Martin | ... | Charles Knerlman#1 |
| Jane Curtin | ... | Enid Loopner#3 |
| Garrett Morris | ... | Grant Robinson Jr.#1 |
| Bill Murray | ... | Todd DiLaMuca#4 |
| Gilda Radner | ... | Lisa Loopner#4 |
| Anne Beatts | ... | visitor |
| Tom Davis | ... | fair announcer Voice |
| Lee Mayman | ... | visitor |
| Tom Schiller | ... | visitor |
| Rosie Shuster | ... | visitor |