Threatening the Japan of 1969, a country trying to pull itself together from the aftermath of WWII, the Invaders are a mysterious and wicked team of aliens. The only groups aware of their existence are the Gatekeeper teams, although the Invaders have been amongst humans in secrecy for decades. While most are disguised as what appear to be men in black suits with thick, black sunglasses, there are a handful of Invaders in red suits whose scarlet altered appearance suggests they are the leaders. Why are they here on Earth? What do they plan to do? Where did they come from? With the power to combine with other Invaders, their very existence is a mystery to even the Gatekeepers who stand and fight against these aliens of terrorism.