Katherine Elaine Soucie ( /ˈsuːsi/ soo-see; born February 20, 1967) is an American voice actress. She is sometimes credited as Kath Soucie, Katherine Soucie, Kath Souci, Kath E. Soucie, and Kath Eleanor Soucie. She voiced Cubert Farnsworth from Futurama, Phil, Lil & Betty Deville on Rugrats, Maddie Fenton on Danny Phantom, Tillie on The Little Engine That Could (1991), Fifi La Fume and Li'l Sneezer on Tiny Toon Adventures, Sally Acorn on Sonic the Hedgehog SaTaM, Percy on Thomas and the Magic Railroad and Princess What's-Her-Name on the Earthworm Jim Cartoon series.