Unlike in the comics, where Parasite has been a recurring villain since his debut in the Silver Age, this Parasite, one I. C. Harris, was a 1-shot villain, for reasons that are made clear in the course of this story. Harris never appeared in the comics. Apparently, writer Oscar Bensol wasn't satisfied with the Parasite that had appeared in the books at the time.
In the 1996 Superman series, a later incarnation of Parasite made his television debut. We'll see him another time.