The Hideous Sun Demon (1958)

 

After exposure to radiation, an atomic research scientist finds himself changing into a murderous, lizard-like creature every time he is exposed to sunlight.

Silly low-budget sci-fi horror flick is good for some unintentional laughs, especially for the ridiculous monster costume.

Halliwell (no star): "Simple-minded science fiction featuring the producer-director-star in an ill-fitting monster costume."

Maltin*1/2: "Hideously low-budget production..."