Nathan Lane Ernest "Ernie" Smuntz Lee Evans Lars Smuntz Vicki Lewis April Smuntz Maury Chaykin Alexander Falko Eric Christmas Ernie and Lars' Lawyer Michael Jeter Quincy Thorpe Debra Christofferson Ingrid Ian Abercrombie Auctioneer Annabelle Gurwitch Roxanne Atkins Eric Poppick The Banker Ernie Sabella Maury, the Cat Care Society Owner William Hickey Rudolph Smuntz Christopher Walken Caeser, the Exterminator Melanie MacQueen Mayor's Wife Mario Cantone Zeppco Suit #1 Suzanne Krull Waitress #1 William Frankfather Mr. Texas Frank Welker Catzilla, Mouse Jack Angeles Kennel Employee (uncredited) Greg Bronson Neighbor (uncredited) Whit Hertford Vinny (uncredited)