Darkwing Duck - Season 1 Episode 4 -

The owner of the local mini-golf, Lilliput, has invented a helmet that allows him to communicate with ants. He then uses a shrink ray to shrink the buildings and landmarks of St. Canard, using the ants to haul the now-shrunk buildings back to the mini-golf, where thay become part of the course. When DW discovers his secret, Lilliput shrinks him down a tiny size, smaller than an ant. DW now has to foil the villain's plot, and get back to normal.