Sci-fi TV shows are super fun to watch, with strange science theories and wondrous otherworldly technology that make the whole storyline totally mind blowing. But do you know what really makes a sci-fi show out of this world? Aliens, that's what!Here are ten classic 80s TV shows that feature aliens, or alien technology, as a main part of the plot:1. The Greatest American Hero (1981-1983)-(Image Link)Mild mannered teacher Ralph Hinkley is given the opportunity of a lifetime when a group of aliens bestow a...