Minions are yellow henchmen who have existed since the beginning of time, evolving from yellow single-celled organisms into beings who have only one purpose: to serve history's most ambitious villains.[5] After their ineptitude destroys all their masters, including a T. Rex, Genghis Khan[6] and Dracula, they decide to isolate themselves from the world and start a new life in Antarctica.[7] Sometime in the 1960s, the lack of a master drives them into depression, so Kevin, Stuart and Bob set out to find a new one.[6][7] They arrive at a villain convention, where they compete for the right to be henchmen for Scarlet Overkill, a stylish and ambitious villain determined to dominate the world and become the first female super-villain.[8][9]]
http://en.wikipedia.org/wiki/Minions_(film)