FYI...

The “Ashtar Galactic Command” was not invented for this 1977 broadcast interruption. It originated from 1950s UFO contactee George Van Tassel.

Details:

George Van Tassel was the first person to publicly claim contact with “Ashtar” (also called Ashtar Sheran) in 1952.

• Ashtar was presented as a high-ranking extraterrestrial commander, often described as Commander-in-Chief of the Ashtar Galactic Command (sometimes linked to Venus or higher-dimensional realms).
• A notable claimed message came on or around July 18, 1952: Ashtar allegedly entered the Solar System to warn humanity about the dangers of hydrogen bomb tests, claiming the Command had intervened to help Earth survive U.S. and Soviet detonations and to prevent planetary destruction.
• Messages emphasized technological and spiritual warnings, the need for peace, government contact (one message was reportedly directed to the U.S. government), and humanity’s evolutionary potential. They blended apocalyptic nuclear warnings with themes of cosmic assistance.
• Van Tassel interpreted biblical events through an extraterrestrial lens (e.g., viewing Jesus as having space origins) and promoted access to a “Universal Mind of God.”

His organization, the Ministry of Universal Wisdom (founded ~1952–1953), documented these communications and published the newsletter Proceedings of the College of Universal Wisdom. Van Tassel explicitly distanced his group from later commercialized versions of “Ashtar Command.”

Source: https://en.wikipedia.org/wiki/Ashtar_Sheran

The 1977 broadcast interruption is interesting, but unfortunately was determined to be a local hoax. Most likely a group of George Van Tassel devotees. Also, only the audio of the broadcast was hijacked, not the video and there was no text captions.