A brilliant madman has invented a foolproof, detection-proof scheme to bring America and its allies to their knees with one press of a button. He calls it: MASTERSTROKE. The only men with a faint chance of stopping MASTERSTROKE are Kelly Robinson, whose ne'er-do-well charm hides a nerve of steel, and Alexander Scott, the quipster with a computer mind - the I SPY team. Their one slim - but well-rounded clue - a red-headed Chinese beauty, recent companion of the enemy mastermind, who shows a suspicious yet for Kelly... Meantime, the hand moves toward the button that activates MASTERSTROKE...