Missile X – Geheimauftrag Neutronenbombe (English: Missile X: The Neutron Bomb Incident; also known in the United States as The Tehran Incident) is a 1979 Eurospy adventure film directed by Leslie H. Martinson, and starring Peter Graves and Curd Jürgens.

The story concerns an experimental nuclear cruise missile which is stolen from a Soviet military site in the USSR.

The Baron plots to use the stolen Soviet missile to destroy an international peace conference in one week located on an island in the Persian Gulf.

Alec then travels from Tehran to Abadan where he meets Konstanine, a Soviet KGB intelligence agent who is in Iran searching for leads to locate the missing cruise missile, which leads to Alec and Konstantine joining forces along with Galina, another Soviet agent, and Leila, an undercover Iranian policewoman, to investigate the Baron in order to find the location to where the cruise missile is being kept before it is used to start World War III.

On June 2, 2017, RiffTrax released as a VOD an edited 84-minute version of the film with a comedic commentary track by Michael J. Nelson, Kevin Murphy, and Bill Corbett.