Lurker & One-Eye are enemies of Space Ghost in the original Hannah-Barbera series.
The episode that they appeared in takes place at the Space Sargasso, a region choked with strange growth and contains many wrecked ships. It is also the home of Lurker (voiced by Paul Frees), who is responsible for most of them with the help of One-Eye (voiced by Don Messick).
Using his Purple Sleep Mist, One-Eye captures passing ships and loots their cargo. When he captures the Phantom Cruiser and Space Ghost, the pair plans to sell the law enforcer to whichever of their enemies will pay the most.
Fortunately, Jan and Jase managed to evade capture, but unfortunately, they must surrender when Lurker threatens to vaporize Space Ghost. Looks like Blip will have to save them all again.