Zontar, The Thing From Venus (1966)

A misguided scientist (Tony Huston) enables an alien from Venus named Zontar to come to Earth in order to help solve man’s problems. However, Zontar has other ideas, like disabling the power supply of the entire world and taking possession of important officials with mind control devices. Also stars John Agar and Susan Bjurman. Also with Pat Delaney and Bill Thurman.