So a while back, I reviewed “The Boy with the Ultra-Powers,” the first appearance of Jo Nah of Rimbor, later to be known as the Legionnaire called Ultra Boy. In that first appearance, in Superboy 98, Jo talked on and on about his Penetra-Vision, which allowed him to assist (and baffle) Superboy by seeing through lead. Superboy’s X-Ray vision couldn’t do that, so this was a pretty big deal.
The other Legionnaire who could out-see Superboy was Star Boy, who first appeared in “Lana Lang and the Legion of Super-Heroes” in Adventure Comics #282. In that story, Star Boy also had all of Superboy’s other powers.