Let's face it: sci-fi is often silly. Now, before you hurl your drool-moistened Phillip K. Dick novels through your monitor, we're talking about sci-fi, not science fiction. Amongst those who make a distinction between the two (us nerds, that is), science fiction deals with how science will change the human condition, while sci-fi usually deals with hallway-chasing-explosions, weirdly shaped knife-fights and Megan Fox's ass... although not necessarily in that order.

Sci-fi is the watered-down, mass media version of science diction, the generic Dr. Thunder to the true amazingness of Dr. Pepper, if you will. But since most people don't know the difference, you get non-fans thinking that Independence Day is the epitome of smart science fiction (although, it did teach us all how explosive a drunk Randy Quaid can be). And even worse, since a lot of sci-fi is shaped by executives who thought Lost in Space was a true vision of the future, it falls into the trap of showing the same clichéd stories with the same clichéd characters over and over again. Here are the 10 worst.

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