Golgafrinchans

The Golgafrinchans were a race of humanoid beings who split their population into three distinct groups and sent their third group, the middlemen, on a spaceship which eventually ended up on planet Earth. The Golgafrinchans were later revealed to be the true ancestors of humans, instead of apes. Arthur Dent and Ford Prefect materialised inside Ark Fleet Ship B, where they met the Golgafrinchan Captain, and later lived with the other middlemen for a short period of time on pre-historic Earth...