<Li> Richard Kind as Molt, Hopper's dim - witted younger brother </Li> <Li> David Hyde Pierce as Slim, a walking stick and Francis and Heimlich's friend </Li> <Li> Joe Ranft as Heimlich, a plump, German - accented caterpillar that longs to be a butterfly </Li> <Li> Denis Leary as Francis, a short - tempered ladybug that is constantly mistaken for a female </Li>

Name of caterpillar from a bug's life