Originally, "Warhead" was a television movie called "Prisoner in the Middle" (1974). It was somehow released in some theaters in 1977 as "Warhead".
When the movie began, I could quickly tell it was a movie made on the cheap. For example, a CIA operative (David Janssen) is about to parachute into the desert...and they cut away and suddenly he's on the ground gathering up his parachute. Moments later, a school bus is attacked in the desert...and they show they about to attack and then it cuts to the bus suddenly lying on its side...having been blasted. But you see no blast....it's as if the warning "Scene missing here" should be emblazoned across the screen!
The plot involves Palestinians, Israeli soldiers and a lone CIA operative (Janssen) all scrambling to retrieve a lost US Air Force nuke accidentally dropped in the Jordanian desert(???). Why the USA would only send one guy is confusing, that's for sure! The nuke ends up changing hands repeatedly.
So is it any good? Not really. The acting is passable but the film itself lacks energy and interesting characters...and a decent budget. Overall, it just really looks cheap...incredibly cheap! And, it is also not especially entertaining...which is odd considering the subject matter.