I got the idea for this cartoon from a dream I had about seeing an all-new episode of The Jetsons where Judy became a giantess. So why is her outfit a different color than it usually is? Don't ask me, ask my subconscious. As for how she became a giantess, the dream didn't really give details on that (or I forgot the details on that). One possibility is that corporate spies stole Spacely's Minivac technology, reversed the process and then zapped Judy with a growth ray.