"Ultimate Warlord", by The Immortals. This song, which appears to be the only record The Immortals ever made, also seems to be a cover, credited to someone with the unlikely name of "Daniel Boone", who also released it as a single, under the moniker The Warlord, in the same year, 1979. Or maybe Mr Daniel Boone was behind both entities. I think we should be told.
The ten-year-old likes this because he can act out a Transformers-inspired musical-theatre piece over the length of its nine minutes. I like it because it's an intriguing slice of science-fiction disco which comes across as an amalgam of "Woman", by Mirage, and "I Was Made For Loving You", by Kiss. You can't invent something like that.