Previous Post The relationship is from "Worlds Collide" when Superman, Steel and Superboy teamed up with the Dakota heroes to stop Rift. They remember what happened back then and are still friends as a result.

Well there's more to it than that now, since the history of the DCU and Milestone have been stitched together so that now they think they've always lived on the same Earth. Even though "Worlds Collide" did still happen, I doubt they remember it since that storyline dealt with them on alternate Earths, something they shouldn't remember.