Hayden Panettiere , Phyllis Diller , Richard Kind , Denis Leary , David Hyde Pierce , Jonathan Harris , Madeline Kahn , Bonnie Hunt , John Ratzenberger , Brad Garrett , Michael McShane , and Roddy McDowall did voice acting for the film A Bug 's life .
The film stars the voices of Dave Foley , Kevin Spacey , Julia Louis-Dreyfus , Hayden Panettiere , Phyllis Diller , Richard Kind , Denis Leary , David Hyde Pierce , Jonathan Harris , Madeline Kahn , Bonnie Hunt , John Ratzenberger , Brad Garrett and Michael McShane , with Roddy McDowall 's final film appearance before his death .