The Great Sperm Race

National Geographic goes all out:

People dressed in all white literally act out the role of sperm in the race to become one with the egg, running through valleys, squeezing through spirals, battling Leukocytes and much more. The impressive undertaking was completed with helicopter-mounted cameras, world-renowned scientists, CGI and over-the-top reconstruction of the sperm’s journey played out in real life by humans.

It airs tomorrow. More info here.