IIRC, Zark was an American invention when it was re-edited as Battle of the Planets, to be a "kid friendly" narrator to the story and to fill in space from editing. Like Yamato, there were some occasional not-so-kid-friendly aspects to Gatchamen that had to be clipped. When episodes came in short, they put in the robot (a very R2-D2/IQ-9 kind of character that kids could easily relate to). You'll notice that his blinky lights are generally in synch with the English-speaking voice, as opposed to the dubbed Japanese footage. I doubt he'll show up in the Japanese version, but I could be wrong - a cameo, maybe.
Kind of interesting, anyway. Looking forward to seeing the Phoenix in all her glory. Loved that thing!
If Princess doesn't flash her panties every other scene I'm boycotting!
This is more likely to happen.