Zachary Levi ... Toby
David Cross ... Ian
Jason Lee ... Dave
Justin Long ... Alvin (voice)
Matthew Gray Gubler ... Simon
(voice)
Jesse McCartney ... Theodore (voice)
Amy Poehler ... Eleanor (voice)
Anna Faris ... Jeanette (voice)
Christina Applegate ... Brittany
(voice)
Wendie Malick ... Dr. Rubin
Anjelah N. Johnson ... Julie (as
Anjelah Johnson)
Kathryn Joosten ... Aunt Jackie
