Here are some frames from a short animation about fertilization that I have just posted on YouTube.
The environments and sperm were modeled and textured in Zbrush. The animation was done in Modo, and the compositing was done in Fusion and HitFilm.

The film can be viewed on the following YouTube link:
https://www.youtube.com/watch?v=0lu9MEqZnvs

Hope that you like it.

Tim