In the skies over Los Angeles, a new kind of guardian hides a dark secret in John Badham's high-flying action thriller. Veteran police pilot Frank Murphy, played by Roy Scheider, is assigned to evaluate "Blue Thunder," a sleek, heavily armed prototype helicopter designed for urban counter-terrorism. With his observant rookie partner, Daniel Stern, Murphy soon uncovers that the aircraft's terrifying capabilities and its cold, calculating commander, Malcolm McDowell, are intended for a far more sinister purpose than public safety. As Murphy digs deeper, he finds himself targeted by the very system he swore to protect, forcing him to take the ultimate machine of control on a desperate, unauthorized mission to expose the truth. This pulse-pounding cat-and-mouse game transforms the city's streets and skyline into a battleground, where one man in an unstoppable machine must outfly and outthink a conspiracy that reaches the highest levels of power.