Yup, the rear wheel has a five-speed cog. The bike is red and it says "Eagle Point" on it, hopefully someone can give me an idea of how old it is. There's another issue with the wheel - one of the spokes is broken, and the clear plastic that goes behind the cog might as well not be there.

I'm going to actually take the dyna to Toys R Us and see if they'll take it back. If they don't, however, I was thinking about switching the wheels from the Dyna to the FS. They're the same size (26" I believe). The only problem is that the Dyna has a 7-speed cog and the FS has a 5-speed, but I can get those swapped at my LBS right?