Fake Me to Your Leader (S02E11)

Zipper's feelings are hurt when the other Rangers tell him he's too small and weak to help them do a lot of things. But when Zipper is accidentally zapped by Professor Nimnul's "gigantico ray" gun, he starts growing larger, until he can carry the other Rangers on his back. Nimnul uses the gun to enlarge pill bugs into human-sized creatures as part of a scheme to make the population think they are being invaded by aliens from outer space, and extort the city's gold supply. Zipper, now giant-sized, forces Nimnul to return him to normal, and the scheme is foiled. (iTunes)