I pulled a trick with this video, but I rendered everything in one go, without having to composite separate animations in post:

Unicorn Run (MPEG format, 2.6MB)

That's one custom figure (the blue guy in front) and a dragon's dozen of the DAZ Charger (with dynamic-hair mane), raytraced shadows enabled, and the Cyclorama as a backdrop.

The trick? The Charger wasn't actually loaded in the scene. I had a dozen transmapped square props with the Movie node applied to each. Animated cardboard cutouts.