Scientists from the mid-nineteenth century have searched for the fossil remains of the "missing link" in evolution - the half-man, half-ape that would explain where mankind came from. But over the last century and a half, it has been the idea of what a missing link is that has evolved. The history of this scientific quest - peopled with fanatics, frauds, amateurs, professionals, the lucky, the unlucky, the unfairly neglected and the undeservedly praised - is the subject of this documentary. Reen...