Corey Burton

General Knowledge (voice)

Scott Curtis

Bobby (voice)

George Wendt

Stomach (voice)

Jon Lovitz

Right Brain (voice)

Dana Carvey

Right Ventricle (voice)

Bobcat Goldthwait

Adrenal Gland (voice)

Charles Grodin

Left Brain (voice)

Kevin Nealon

Left Ventricle (voice)