I remember watching "Lost Missile" (actually throwing a fit until my brother and several cousins at whose home I was an overnight guest agreed to watch it with me - I was, from time to time, the Eric Cartman of the 1960s - sorry, guys) and being somewhat embarrassed when the sustained wave of million-degree heat emerged as a plot device - even as a second-grader I knew that a mere missile just couldn't carry the energy around for that much heat or devastation over more than the duration and limited radius of a nuclear detonation.
My inflicting that turkey on loving relatives was a self-punishing crime.
The film's production values were very good. The acting isn't bad (apart from the Shatnerism of the actor who played governor's aide that someone else here mentioned).
But the idea of a missile Easy-Baking the surface of the Earth by means of the heat of its exhaust... no.
How'd the people at "Mystery Science Theater 3000" miss "The Lost Missile," anyway?
It's a great classic of unintentional comedy - watch it if you want something to drink beer to some weekend.