Long before Gene Roddenberry had his Romulans invent the cloaking device of invisibility on Star Trek, the creators of Rocky Jones - Space Ranger had Rocky's ship the Orbit Jet outfitted with something called cold light which accomplished the same thing. In Manhunt In Space Rocky needs the cold light in order to ferret out some space pirates who are robbing the earth supply ships to Cassa-7 blind and leaving them in permanent orbit around the planet.
The pirates are led by a couple of earth traitors Henry Brandon and Gibor Curtiz. And of course perennial villain and diva Patsy Parsons as the evil Queen Cleolanta of Ophesius is behind the dirty business.
Sally Mansfield as Vena Ray, Rocky's trusty navigator we find out has a brother in Tom Brown who's in charge of the settlement on Cassa-7. He's also got a traitor in his operation as well.
Some bad editing let a few key scenes go by without proper foundation. Still for those of us who were kids in the Fifties and loved this show back then, Manhunt In Space is your thing.