This alien decided to visit earth. Too bad that when he arrived it was during the French revolution when the guillotine was at its peak. They mistook him for a badly disfigured human, and because the french ran out of political figures to behead they chose him.
Poor little spider alien guy decided to take a late night dip in a earth lake. He had no idea of how filthy and polluted earth lakes were, but he would soon find out. Spider alien guy is the type of alien that accidentally swallows the water. It was because of his dumbass mistake that he experienced a rash on his glossy smooth dome. That rash grew bigger. The next day it grew boils. The next month it had discoloration and grew ugly shut. From then on he avoided earth lakes.
The octtoids were a peaceful species that achieved world peace by exterminating all other sentient lifeforms that proved to egotistical to live side by side. They lived in harmony for about 40 centuries until one day a asteroid containing a parasitic tumor made its way into the octtoids home planet. The parsite then multiplied through asexual means and attached itself to the only lifeform available, the octtoids. The tumors would then push their own agenda by controlling the occtoids. It only took 2 winters for the tumors to destroy all that the octtoids built by being pathetic children and starting wars and exhausting all possible nonrenewable resources. The planet of the octtoids was lost.