Recently Ive been trying to find an appropriate pet for my stuffy South London flat, and after dismissing the obvious choices (simply for reasons of space) Ive been looking at the more exotic of species to take the place of my non-human companion. My quest took me to an Aquarium in central London where I found myself among some of the most bizarre, wonderful and creepy creatures I could have imagined. Axolotls (essentially fish with legs), Scorpions, Hairy spiders, unusual shellfish, Snakes, Lizards- the list was endless and ever more worrying the further towards the back of the store you got. The other thing that occurs to you as a major Sci-Fi fan (other, that is, from the survival instincts that kick in after catching the predatory glare of a giant Scorpion) is quite how many creatures from the best Sci-Fi shows have their roots in more earthly species. Sat in the corner of the store, possibly going slightly crazy after being unable to resist touching a bright blue frog, I started envisioning life with creatures from my favourite shows. It was not pretty, turns out there arent many that would satisfy all criteria of a decent pet and I quickly realised the Axolotl was just fine. It did keep me thinking however, so here are my top 4 Sci-Fi creatures that itd be a nightmare to have. For the purposes of variety (and to avoid this being a trek/gate orgy) Ive limited each franchise to one entry only, and they must originate in outer space. Im certain therell be plenty more too (this is merely a selection from my full list), so make sure you add your suggestions to the comments below.