| Show | The Global Warming Christmas Special |
| Tom Hanks | ... | Dean Martin |
| Ralph Nader | ||
| John Henry Kurtz | ... | announcer Voice |
| Dana Carvey | ... | Paul McCartney |
| Chris Farley | ... | Dom DeLuise |
| Phil Hartman | ... | Issac Asimov |
| Jan Hooks | ... | Crystal Gayle |
| Victoria Jackson | ... | Sally Struthers |
| Mike Myers | ... | Carl Sagan |
| Kevin Nealon | ... | George Hamilton |
| Julia Sweeney | ... | Petula Clark |
| Christine Zander | ... | Linda McCartney |