| Christina Ricci | Ellie Hudson |
| Joshua Jackson | Jake |
| Jesse Eisenberg | Jimmy Hudson |
| Judy Greer | Joanie |
| Scott Baio | Himself |
| Milo Ventimiglia | Bo |
| Kristina Anapau | Brooke |
| Portia de Rossi | Psychic |
| Shannon Elizabeth | Becky |
| Mya | Jenny |
| Craig Kilborn | Himself |
| Lance Bass | Himself |
| Solar | Zipper |
| Daniel Edward Mora | Jose (as Daniel Mora) |
| Michael Rosenbaum | Kyle |
| Michelle Krusiec | Debbie |
Siblings hunt for the werewolf that attacked them and transformed them into lycanthropes.
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