Mothra

Classic Japanese monster shenanigans about an enraged giant caterpillar that invades Tokyo while searching for the Alilenas, a set of very tiny, twin princesses who've been kidnapped by an evil nightclub owner in the pursuit of big profits. After tiring of crushing buildings and wreaking incidental havoc, the enormous crawly thing zips up into a cocoon and emerges as Mothra, a moth distinguished by both its size and bad attitude. Mothra and the wee babes make appearances in later Godzilla epics.