Old Ralphie is the only survivor from the original Melonpool universe that we've encountered so far. He's essentially the product of Ralphie being caught in a 30-year time loop. He's currently searching through time and space for his lost wife and son.
And now Ralphie just became the villain—this really is a new universe!
In Ralphie’s defense he actively wants to avoid destroying the current universe, so at least he’s trying to come up with a better solution.