Frank Quitely’s Offspring, the son of Plastic Man, from The Kingdom—when DC implemented, very briefly the concept of Hypertime.
When did Hypertime …end?
Brainiac, confirms the existence of Alternate Universes in the 30th Century to help Douglas Nolan. Who almost went insane after his brother, Andrew—-Ferro Lad, died.
This is Pre-Crisis, 1983 Legion of Superheroes #300