Cy-Bugs are like a virus. They don't know they're in a game. All they know is eat, kill, multiply! Without a beacon to stop them, they'll consume Sugar Rush! But do you think they'll stop there? (Fix-It Felix: Yes!) WRONG! Viruses do not stop! Once those Cy-Bugs finish off Sugar Rush, they'll invade every other game until this arcade is nothin' but a smoking husk of forgotten dreams.
~ Sergeant Calhoun to Fix-It Felix about Cy-Bugs.
A Hostile Species is an entire race of evil creatures and/or people, common in sci-fi and fantasy genres. Some later redeem themselves, and some individuals within a species may differ in their beliefs.

They are also difficult to defeat if, despite being naturally hostile, xenophobic, or even evil, they are capable of having children or making families; thus, killing a hostile species that is capable of reproducing naturally would still be considered an act of genocide.

Note: Add only races or species to this category. Individual villains do not count.