Two prehistoric shell fish caught in an underwater arms race find that there is more to survival that being the fittest. These bottom feeding buddies prove to be some of evolution's longest and strongest survivors. Who would expect these hard headed heroes to be a match for the primeval oceans predatory leviathans? The Courageous Crustacean episode is the first of the Primordial Soup series; a cartoon comedy about some of the first life on earth.