This Island Earth (1955) IMDb
Seen in 2016.
This review refers to the unedited original, not the MST3K (1996) version.
Scientists happily using plans they can’t understand build a triangular TV with a neutrino(!) death ray, telling no one. Later, scientists in space have no understanding whatsoever of the relationship between gravity and acceleration. They are not surprised to hear of a “thermal barrier” at the edge of the solar system. Just another day in science.
Kitsch. A couple of good ideas, almost eschewing heroic monster-bashing, almost undermining imperialism, but it doesn’t have the writing or the artistry it needs. The models and matte paintings are cozy, but totally unconvincing. See it for the unintentional comedy.