A scientist creates a telescope-like device that captures light-waves from the Andromeda Galaxy, giving him a way to view the distant past. Using this knowledge, he travels to Africa to locate a large, unusual meteorite that fell there a billion years earlier. He discovers that the meteorite is composed of a poisonous unknown element, "Radium X". After exposure to its rays begins to make him glow in the dark, his touch becomes deadly, and he begins to be slowly driven mad.

References:
https://en.wikipedia.org/wiki/The_Invisible_Ray_(1936_film)