Mario:
Mario is a car mechanic living in the crime-ridden Mushroom Kingdom. Living there, he's grown to loathe the native creatures of the place since he, his brother and his girlfriend and were trapped there many years before. Nobody is human, and everyone seems to be involved in some sort of dirty work. The only other humans in the entire place are the women King Koopa breeds for his harem. After they grow too old, he lets them go, and they're often forced into prostitution. The warpzones and pipelines lead to other dimensions, or "worlds", some not entirely coherent-- abstract, intangible monsters float around in a black void, colors vibrant, flat, and changing constantly. Sometimes they won't take you anywhere. Mario hasn't seen his brother Luigi in months, ever since he became depressed and sick of this place, and started taking random pipelines over and over again, hoping he'll end up on Earth eventually. One night, Mario and Peach are attacked in their sleep by two of Koopa's men; collosal armored reptiles, snarling and cackling wretchedly as they kidnap Peach, leaving Mario beaten and, they assume, dead.

Pac-Man:
A dangerous project is developed in a remote science facility, a machine that can create controlled, enclosed black holes; potentially, it could be used to rid the world of environmentally harmful pollutants, but if the device ever malfunctioned, it could swallow the planet. The government steps in and shuts the priject down, and having the prototype model dismantled; the P.A.C. (abbreviation needed). Many years later, extraterrestrial life comes to Earth in the form of incorporeal beings of light that can possess inanimate objects and create bodies for themselves, some even possessing human bodies to wage their war on humanity. The scientists who developed the P.A.C. escape from the war to their abandoned facility to re-activate the machine, thinking that its black hole capabilities may be able to swallow the creatures. They program basic battle A.I. into the machine after testing it and finding that it's still entirely functional, and send it out into battle. Essentially, the story carries on from here when the P.A.C. is unable to destroy the incorporeal forms of the creatures, and instead simply destroys their current bodies, whether debris or possessed humans, and the aliens escape to find a new vessel. The battles are apocalyptic and many people are killed. The world faces its end.

Space Invaders:
A man in the last machine built to defend his homeworld fights a hopeless, endless war against the invading armada that burned his planet to nothing. He is forced to destroy what is left of the civilization that was, defending himself against the alien attackers. His battle is futile.