The Invisible Monster (Jonny Quest)
I watched all 26 episodes of the Jonny Quest collection (1964-1965). One of the best was The Invisible Monster, which pits a mysterious energy-sucking entity against the Quest crew. The monster is a bit like a cross between the Monster from the Id (Forbidden Planet)(there’s even a footprints in the soil sequence) and the brain-suckers from Fiend Without a Face. The monster looks a lot like the Xenomorph from It Came from Outer Space! Check it out.