What is Hypertime? Hypertime is a network of alternate timelines that branch off from the DC Universe. These timelines sometimes overlap each other, causing alterations in reality. It is, in essence, the reason we - observers outside DC's reality - can notice how heroes are the same age in different decades, be aware of various continuities and discrepancies, etc. while the characters within the universe cannot. So while the Kryptonian Krypto does not currently exist in the DCU, he does exist somewhere in Hypertime, for having existed ONCE.
The concept was first mentioned in The Kingdom. The long-lost Krypto further appeared in Planet Krypton, a Hard Rock Café-style establishment haunted by Hypertime "ghosts" from past continuities.
Comments
Not a great way to sell us on Hypertime, DC.
For me, anyway, it is the WORST way. It is a reminder that all the mistakes still exist.
Now there are of course differing opinions on what constitutes a mistake, and it would be foolish of me to demand that DC keep only "the good stuff". But I would be pleased if DC would make a policy of retroactively softening the things that readers find offensive. Like for example, we can go back on forth on whether we prefer Barbara Gordon in a wheelchair, but maybe DC could at least change the story of how she got in the wheelchair so it's less rapey. She got shot by the Joker, fine; but take away the parts where he stripped her naked and took photos. Flush that down the /dev/null of the multiverse, where it can't be retrieved even via Hypertime.