 John Clark of the CIA is chosen to lead Rainbow, a unit comprised of the best anti-terrorism operatives of the entire world. Based in Great Britain, they are able to battle terrorists wherever they may strike. *****Spoilers***** shortly after its formation the group faces a challenge of the likes none of them have ever dealt with before. A radical group of environmentalists are planning a devastating germ attack that will wipe humanity from the face of the earth. Clark, under the designation of Rainbow Six, will need to use every skill he and his men possess to counter this threat.