I talked with Kirk Alyn at a comic show back in the '70s, and he said he'd never seen this 15-chapter serial. At the time it came out he was too busy working, and he finally got around to asking Columbia to show it to him they denied having a copy. He had it on good authority, though, that they had it locked away in their vault.
Well, somebody sure had a copy, because it was finally released on VHS in 1987. Alyn was around until 1999, so it's pretty likely he finally got to see it. Anyway, here's the whole dang thing. This one's for you, Kirk.