Based on the ending im guessing it involves fighting off killer kids

It was one of my favorite movies as a kid and I rewatched it for the first time as an adult not to long ago and still liked it. I think it's just one of those weird and kind of dark comedies that came out more often in the late 80's and early 90's.

The fact that Smile never plays a slow creepy version of Smile by Vitamin C is really it's biggest fault.

Or maybe she learned to use the molecular freezing power to make a personal forcefield

I think it's her flying above US Agents shoulder

I had the same thought when I watched it recently