A massive asteroid named Orpheus, dislodged by a distant comet, hurtles towards Earth, causing catastrophic fragments to break off and rain destruction. NASA scientist Dr. Paul Bradley, who previously designed a powerful orbital weapon initially intended for defense against such threats, is called back into service to devise a solution. Amidst the mounting global panic, Bradley must work with his Soviet counterpart, Dr. Dubov, despite Cold War tensions. Both nations possess similar space-based nuclear platforms covertly developed as a form of mutually assured destruction rather than planetary protection.

Striving to avert annihilation, Bradley and Dubov advocate for an unprecedented collaboration between the United States and the Soviet Union to repurpose their nuclear arsenals against the asteroid. Political leaders, including U.S. President James and Soviet Premier, reluctantly agree to set aside their hostilities. The two superpowers must navigate a maze of mistrust and logistical hurdles to synchronize their efforts for a desperate joint space mission. As the clock ticks down and chaos ensues on Earth, humanity's survival hinges on this fragile alliance and the success of their audacious plan.