We recently watched Episode 13 of Josie and the Pussycats in Outer Space, which is called "The Hollow Planet". The premise of the episode is that the main characters are turned into little kids, and they have to find a way back to normal.
(There's a Star Trek episode with the same premise. Mary wanted to watch it, but we couldn't find it. So we watched the Josie and Pussycats version.)
The villains in this episode are robots, who built the planet Metallis. It operates mainly by pneumatic tubes and moving sidewalks, and I wouldn't be surprised if the scenery from this episode was taken directly from The Jetsons. The age ray that the villains have is actually a missile, which lets out circles. It operates in either direction; that is, it can make you younger or older.
I'm not sure if the age ray lets you keep your memories or not. When Alexander got turned into a kid, he seemed to forget everything. When Alexandra got turned into a kid, she still remembered who everybody was and what was going on. Maybe she has a better memory than he does. Either way, it's an interesting concept. An age ray that will make you young again, at the price of all your memories. Is that worth using?
Our heroes throw out the age ray at the end, because it's too dangerous. No! What are you thinking?! You could use that device to live forever! You could also make a fortune off of it, by making old people young again! I'm sure there are some young people who'd like to become older, as well.
All in all, it's a pretty standard episode. Some of the dialogue was funnier than usual, and the idea behind the episode was neat, even if it was just an excuse to have our heroes become cute children. I liked it!