It's 1980, and aliens are invading earth, kidnapping people and harvesting their organs. They are opposed by S.H.A.D.O., a top-secret agency with headquarters in a lead-lined bunker 80 feet beneath a London film studio. Led by dedicated Cmdr. Ed Straker (Ed Bishop), S.H.A.D.O. deploys an incredible arsenal of high-tech weapons to stop the extra-terrestrial invaders in this British 1970s television series.