Re the writer’s query, I would say that the film is Five Million Years to Earth (1967), British title Quatermass and the Pit, one of scripter Nigel Kneale’s “Quatermass” series about English exobiologist Bernard Quatermass, here played by Andrew Kier. In the film,.workers digging a London subway discovered a Martian spaceship that has been buried for 5 million years and Quatermass and crew are called in to investigate. Using a diamond drill, the army manages to gain access to the ship’s interior, where they find the bodies of dead, locust-like aliens that are rapidly decomposing.

At some point an electrical worker zaps the ship with a high voltage cable, causing it to emit psychic waves that telepathically dominate some people and cause poltergeist-like energy disturbances throughout the city. The activation of some mechanism causes a towering “thought form” representing one of the Martians to materialize above the ship, appearing as a glowing mass of force crowned by a pair of satanic-looking horns. Scientist James Donald comandeers a giant crane and rams the metal mass into the apparition, shorting it out but electrocuting himself.

This sounds a lot like the film described. Although it’s in color, its possible it was seen on a black and white TV set. Hope this has been helpful.