Science fiction has portrayed its fair share of glitchy and bumbling robots over the years, but none hold a candle to Invader Zim's GIR. Quite possibly the most erratic and unhelpful robot to ever hit the screen, GIR has become one the most loved and oft-quoted characters to appear in a sci-fi cartoon in years.
When humans finally conquer space, we'll still want to keep other creatures as pets. Some science-fiction pets are among our favorite characters, but others, you just want to flush out the airlock. Here's our list of the best and worst.