Star Trek was an experimental science fiction television series for adults.
It was a low-budget production because fancy special effects couldn't be afforded, it built its stories around very human characters.
One character was an alien named Mr. Spock, he had pointy ears and bled green blood.
Mr. Spock, the symbol of reason worked well with another character, Captain Kirk who was the commander of the Starship Enterprise, the symbol of emotion in human nature, together, they represented the basic conflict between head and heart.
Star Trek was on the air for three seasons before its ratings declined and the show was canceled.
Then a miracle happened, reruns became popular, the show refused to die.
Fans called themselves Trekkies, they watched episodes many times and held conventions that attracted as many as twenty thousand people.