Thomas as Captain James Conrad
Cecil Clayton as Lieutenant Colonel Preston Packard
Big Mac as William "Bill" Randa
Ten Cents as Houston Brooks
Winnie the Pooh as Victor Nieves
Tramp as Lieutenant Hank Marlow
George as Major Jack Chapman
Harold as Warrant Officer Glenn Mills
Reg as Warrant Officer Reg Slivko
Tigger as Captain Earl Cole
Donald Duck as Steve Woodward
Scrooge McDuck as Senator Wills
The Vultures as Psychovultures
Maleficent as Mother Longlegs
Squidward Tentacles as Mire Squid
Principal Brown as Godzilla (cameo; as a cave painting and roar)
Nicole Watterson as Mothra (cameo; as a cave painting)
Mr. Small as Rodan (cameo; as a cave painting)
Miss Simian as King Ghidorah (cameo; as a cave painting)