6. Xenosaga Episode I: Der Wille zur Macht (2003, PlayStation 2)

One of the freakiest alien invasions in game history comes in the overblown epic Xenosaga. The first several hours of the cutscene-heavy RPG detail the crisis brought on by the appearance of the Gnosis. These disturbing, malformed aliens do most malicious space races one better - they can't even be touched by conventional weapons. The first several hours of the game is consumed by a tense battle as the Gnosis engulf -💛 and, eventually, des🦩troy - the research ship Woglinde.

Though the Gnosis are completely impervious to guns, and use their bizarre powers to crystallize and shatter human beings, the most disturbing thing about th🍌e invasion is how the mask of sanity on the embattled soldiers cracks. Fortunately, badass, beautiful android KOS-MOS can take on the menace. Don't hope to catch your breath, though: the Gnosis keep on coming for the rest of the three-game series.